[1] *Alma College Centennial Book, 1877–1977*. Edited by Katherine Dobson Riddell. St. Thomas, Ontario: Phibbs Printing World, 1977.

[2] Andreas, A.T. *History of Chicago: From the Earliest Period to the Present Time*. Volume 2. Chicago: The A. T. Andreas Company, 1885. books.google.com/books?id=

[3]* The Canadian Almanac and Repository of Useful Knowledge for the Year 1894*. Toronto: The Copp, Clark Company, 1893. archive.org/details/cihm_29677/page/n10/mode/2up.

[4] Carroll, Maureen T., and Elyn Rykken. *Geometry: The Line and the Circle*. Providence: AMS/MAA Press, 2018.

[5] Evenden, Edward Samuel. *T**eachers’* *Salaries And Salary Schedules In the* *Unite**d* *States 1918–19*. Washington, DC: The National Education Association, 1919.

[6] "Ex-Deacon Sykes Convicted." *New York Times*, March 11, 1888, p. 1.

[7] “Final report of the National Committee of Fifteen on Geometry Syllabus.” *The Mathematics Teacher* 5, no. 2 (1912): 46–131.

[8] Green, Judy, and Jeanne LaDuke. *Pioneering Women in American Mathematics: The Pre-1940 Phd’s*. Providence: American Mathematical Society, 2009.

[9] “Miss Mabel Sykes Teacher for 39 Years, Dies at 70.” *Chicago Tribune*, February 8, 1938, p. 16.

[10] “Mr. Sykes's Transactions.” *New York Times*, December 11, 1886, p. 1.

[11] “Periods of Service of the Officers of the National Council of Teachers of Mathematics.” *The Mathematics Teacher* 47, no. 1 (1954): 22–40.

[12] Price, G. Baley. “William LeRoy Hart 1892–1984.” *Mathematics Magazine* 59, no. 4 (1986): 232–238.

[13] *Proceedings of the Board of Education of the City of Chicago: July 17, 1895, to July 1, 1896*. Chicago: John F. Higgins, 1896.

[14] “Reports of Meetings: Report of Meeting of Teachers of Mathematics of the Cook County and Chicago High School Association.” *Sc**ho**ol* *Science and Mathematics* 1 (1903): 38–40.

[15] *Reports* *to the General Assembly of Illinois*: 1892. Volume 1. Springfield, IL: H. W. Rokker, [1893]. books.google.com/books?id=

[16] Schreiber, E.W. “The First Quarter-Century of the Mathematics Section of the Central Association.” *Sc**ho**ol **Science and Mathematics* 29 (1929): 366-374.

[17] *Wellesley College Calendar 1887*. The Wellesley College Catalogs, 124. Wellesley, MA: Wellesley College, 1887. repository.wellesley.edu/catalogs/124.

[18]* Wellesley College Calendar 1888*. The Wellesley College Catalogs, 125. Wellesley, MA: Wellesley College, 1888. repository.wellesley.edu/catalogs/125.

[19] *Wellesley College Calendar 1889–1890*. The Wellesley College Catalogs, 127. Wellesley, MA: Wellesley College, 1889. repository.wellesley.edu/catalogs/127.

[20] *Wellesley College Calendar 1890–1891*, The Wellesley College Catalogs, 128. Wellesley, MA: Wellesley College, 1890. repository.wellesley.edu/catalogs/128.

[21] *The Wellesley College Magazine* 1 (1892–1893).

[22] *Wellesley College Record 1875–1912: A General Catalogue of Officers and* *Students*. Wellesley, MA: Wellesley College, 1912. books.google.com/books?id=z1lIAAAAYAAJ.

[23] *The Wellesley Prelude*, Wellesley College, September 26, 1891. repository.wellesley.edu/prelude/72.

[24] Alumnae biographical file of Mabel Sykes, Wellesley College Class of 1891. Wellesley College Archives, Library and Technology Services, Wellesley, MA.

[25] Alumnae biographical file of Marion Sykes, Wellesley College Class of 1895. Wellesley College Archives, Library and Technology Services, Wellesley, MA.

[26] “Who’s Who in This Issue.” *School Science and Mathematics* 35 (1935): 121–122.

[27] Sykes, Mabel. “Aims and Methods in the Teaching of Plane Geometry.” *School* *Science and Mathematics* 1, no. S2 (June 1903): 76–79.

[28] Sykes, Mabel. “Radical and Conservative Elements in the Teaching of Mathematics.” *The School Review* 13, no. 1 (1905): 59–69.

[29] Sykes, Mabel. “Some Practical Applications of Elementary Geometry.” *School* *Science and Mathematics* 6 (1906): 367–370.

[30] Sykes, Mabel. “The Circumference of a Circle of Given Radius.” *Scientific American*, August 26, 1911, 72 (supplement 1860): 135.

[31] Sykes, Mabel. “The Case Against High School Mathematics.” *School Science and* *Mathematics* 17 (1917): 667–676.

[32] Sykes, Mabel. “A Note to Trigonometry Teachers.” *School Science and Mathematics* 25 (1925): 800.

[33] Sykes, Mabel. “Some Pedagogical Aspects of Geometry Teaching.” *The Mathematics Teacher* 20, no. 8 (1927): 466–472.

[34] Sykes, Mabel. “Note on Demons of Elementary Mathematics.” *School Science and* *Mathematics* 29 (May 1929): 533.

[35] Sykes, Mabel. “A Study of Individual Differences as They Effect Mathematics Classes.” *The Mathematics Teacher* 24, no. 3 (1931): 180.

[36] Sykes, Mabel. “The Problem of Individual Differences in Mathematics Classes.” *The Mathematics Teacher* 25, no. 6 (1932): 363–368.

[37] Sykes, Mabel. “Differentiated Assignments.” *School Science and Mathematics* 32 (November 1932): 863–869.

[38] Sykes, Mabel. “The Use of Original Exercises in Geometry.” *The Mathematics* *T**eac**her* 28, no. 1 (1935): 36–42.

[39] Sykes, Mabel. “Some Criticisms of Recent Ninth Grade Algebra Texts.” *School Science and Mathematics* 35 (February 1935): 153–160.

[40] Sykes, Mabel. *A Source Book of Problems for Geometry, Based Upon Industrial* *Design and Architectural Ornament*. With the cooperation of H. E. Slaught and N. J. Lennes. Boston: Allyn and Bacon; Norwood, MA: Norwood Press,1912. Reprint, Palo Alto, CA: Dale Seymour Publications, 1994.

[41] Sykes, Mabel, and Clarence E. Comstock. *Plane Geometry*. Chicago: Rand McNally & Co., 1918. Reprint, 1922.

[42] Sykes, Mabel, and Clarence E. Comstock. *Beginners’ Algebra*. Chicago: Rand McNally & Co, 1922.

[43] Sykes, Mabel. *Training Pupils to Do Algebra: A Handbook for the Sykes-**Comsto**ck* *Ge**ometries*. Chicago: Rand McNally & Co, 1922.

[44] Sykes, Mabel, and Clarence E. Comstock. *Solid Geometry*. Chicago: Rand McNally & Co., 1922.

[45] Sykes, Mabel, and Clarence E. Comstock. *A Second Course in Algebra*. Chicago: Rand McNally & Co., 1924.

[46] Sykes, Mabel, and Clarence E. Comstock. *Answers for Beginners’ Algebra*. Chicago: Rand McNally & Co, 1925.

[47] Sykes, Mabel, and Clarence E. Comstock. *Key to Plane Geometry*. Chicago: Rand McNally & Co., 1926.

[48] Sykes, Mabel, Clarence E. Comstock, and Charles M. Austin. *Plane Geometry*. New York: Rand McNally, 1932.

[49] Sykes, Mabel, Clarence E. Comstock, and Charles M. Austin. *Solid Geometry*. New York: Rand McNally, 1933.

[50] Cederberg, Judith N. Telegraphic Reviews, edited by Arnold Ostebee and Paul Zorn. *The American Mathematical Monthly* 101, no. 9 (1994): 927.

[51] Cobb, H. E. Review of *Source Book of Problems for Geometry,* by Mabel Sykes. *The American* *Mathematical Monthly* 20, no. 5 (1913): 164–165.

[52] Jensen, John M. Review of *Source Book of Problems for Geometry,* by Mabel Sykes. *The Mathematics Teacher* 87, no. 7 (1994): 573–574.

[53] *The Mathematics Teacher* 12, no. 4 (1920): 172.

[54] *The Mathematics Teacher* 26, no. 4 (1933): 250.

[55] Sharwell, Truman P. “New Trends in Geometry Textbooks.” *School Science and* *Mathematics* 27 (1927): 261–263.

[56] Sykes, Mabel. “Report of the Mathematics Section of Central Association of Science and Mathematics Teachers.” *School Science and Mathematics* 8 (1908): 70–74.

[57] Sykes, Mabel. “The Central Association of Science and Mathematics Teachers Algebra Report of 1907.” *School Science and Mathematics* 9 (1909): 114–120.

[58] Slaught, H.E., W. Betz, E. L. Brown, C. L. Bouton, F. Cajori, W. Fuller, W. W. Hart, H. E. Hawkes, E. R. Hedrick, F. E. Newton, H. L. Rietz, R. L. Short, D. E. Smith, E. R. Smith, and M. Sykes. “Provisional Report of the National Committee of Fifteen on Geometry Syllabus.” *School Science and Mathematics* 11 (1911): 509–531.

[59] Sykes, Mabel. “Report of the Meeting of the Mathematics Section of the Central Association of Science and Mathematics Teachers.” *School Science and* *Mathematics* 11 (1911): 82–85.

[60] Sykes, Mabel. “Chicago Geometry Syllabus.” *School Science and Mathematics* 13 (1913): 587–598.

[61] Sykes, Mabel. “The Mathematics Survey of the Chicago School System." *School* *Science and Mathematics* 15 (1915): 120–126.

[62] Sykes, Mabel. “Minutes of the Mathematics Section, Central Association.” *School* *Science and Mathematics* 16 (1916): 174–176.

[63] Sykes, Mabel. “Minutes of Mathematics Section.” *School Science and Mathematics* 19 (1919): 265–267.