Cita APA (7a ed.)

Mayer, H. E. (1987). The Crusades. University Press.

Cita Chicago Style (17a ed.)

Mayer, H. E. The Crusades. Oxford [etc.]: University Press, 1987.

Cita MLA (9a ed.)

Mayer, H. E. The Crusades. University Press, 1987.