APA-referens (7:e uppl.)

Hopkins, C. H. (1951). History of the Y.M.C.A. in North America. Association Press.

Chicago-referens (17:e uppl.)

Hopkins, Charles Howard. History of the Y.M.C.A. in North America. New York: Association Press, 1951.

MLA-referens (8:e uppl.)

Hopkins, Charles Howard. History of the Y.M.C.A. in North America. Association Press, 1951.