APA (7th ed.) Citation

Penn, W., Tolles, F. B., & Alderfer, E. G. (1957). The witness of William Penn. Macmillan.

Chicago Style (17th ed.) Citation

Penn, William, Frederick Barnes Tolles, and E. Gordon Alderfer. The Witness of William Penn. New York: Macmillan, 1957.

MLA (8th ed.) Citation

Penn, William, et al. The Witness of William Penn. Macmillan, 1957.