APA (7th ed.) Citation

Hopkins, C. H. (1951). History of the YMCA in North America. Association Pr.

Chicago Style (17th ed.) Citation

Hopkins, Charles H. History of the YMCA in North America. New York: Association Pr, 1951.

MLA (9th ed.) Citation

Hopkins, Charles H. History of the YMCA in North America. Association Pr, 1951.