APA (7th ed.) Citation

Barnum, P. T. (1983). Selected letters of P. T. Barnum. Columbia Univ. Pr.

Chicago Style (17th ed.) Citation

Barnum, Phineas Taylor. Selected Letters of P. T. Barnum. New York: Columbia Univ. Pr, 1983.

MLA (9th ed.) Citation

Barnum, Phineas Taylor. Selected Letters of P. T. Barnum. Columbia Univ. Pr, 1983.