1. Birth control [electronic resource] : hearings before the Committee on the Judiciary, House of Representatives, Seventy-Third Congress, second session, on H.R. 5978, January 18, 19, 1934. United States. Congress. House. Committee on the Judiciary Washington : U.S. G.P.O., 1934. Book Online
2. Statistics of women at work [electronic resource] : based on unpublished information derived from the schedules of the twelfth census, 1900 / Department of Commerce and Labor, Bureau of the Census, S.N.D. North, director. United States. Bureau of the Census Washington : G.P.O., 1907. Book Online