Cita APA (7a ed.)

Wells, H., & Vosburgh, L. (1957). Barnum, showman of America. David Mckay.

Cita Chicago Style (17a ed.)

Wells, Helen, y Leonard Vosburgh. Barnum, Showman of America. New York: David Mckay, 1957.

Cita MLA (9a ed.)

Wells, Helen, y Leonard Vosburgh. Barnum, Showman of America. David Mckay, 1957.