APA (7th ed.) Citation

Leonard, J. W., & Marquis, A. N. (1899). Who's who in America. A.N. Marquis.

Chicago Style (17th ed.) Citation

Leonard, John W., and Albert Nelson Marquis. Who's Who in America. Chicago: A.N. Marquis, 1899.

MLA (8th ed.) Citation

Leonard, John W., and Albert Nelson Marquis. Who's Who in America. A.N. Marquis, 1899.