APA (7th ed.) Citation

Penn, W., Dunn, M. M., & Dunn, R. S. (1981). The papers of William Penn. University of Pennsylvania Press.

Chicago Style (17th ed.) Citation

Penn, William, Mary Maples Dunn, and Richard S. Dunn. The Papers of William Penn. Philadelphia, PA: University of Pennsylvania Press, 1981.

MLA (9th ed.) Citation

Penn, William, et al. The Papers of William Penn. University of Pennsylvania Press, 1981.