APA (7th ed.) Citation

Barnum, P. T., & Saxon, A. H. (1983). Selected letters of P.T. Barnum. Columbia University Press.

Chicago Style (17th ed.) Citation

Barnum, P. T., and A. H. Saxon. Selected Letters of P.T. Barnum. New York: Columbia University Press, 1983.

MLA (9th ed.) Citation

Barnum, P. T., and A. H. Saxon. Selected Letters of P.T. Barnum. Columbia University Press, 1983.