1. Addams, Jane. Twenty Years at Hull-House With Autobiographical Notes. New York. Originally published in 1910Macmillan, 1925.
2. G. Stanley Hall's Adolescence: Brilliance and nonsense.
3. Barrows, Isabel C., ed. Physical Training: A Full Report of the Papers and Discussions of the Conference Held in Boston in November, 1889. Boston, MA: Press of George H. Ellis, 1899.