Tolong jelaskan mengenai Daftar pustaka dari Troy Perry

Bullough, Vern, ed. (2002). Before Stonewall: Activists for gay and lesbian rights in historical context. Harrington Park Press. ISBN 1-56023-192-0

Tobin, Kay and Wicker, Randy. The Gay Crusaders. New York: Paperback Library, 1972; Arno, 1975 ISBN 0-405-07374-7