APA (7th ed.) Citation

Setton Kenneth M. & Baldwin Marshal W. (1969). A History of the crusades vol 1 (2nd ed.). The University of Wisconsin Press.

Chicago Style (17th ed.) Citation

Setton Kenneth M. and Baldwin Marshal W. A History of the Crusades Vol 1. 2nd ed. Winconsin: The University of Wisconsin Press, 1969.

MLA (9th ed.) Citation

Setton Kenneth M. and Baldwin Marshal W. A History of the Crusades Vol 1. 2nd ed. The University of Wisconsin Press, 1969.