Cita APA (7a ed.)

Mayer, H. E., & Gillingham, J. (1988). The Crusades (2nd ed.). Oxford University Press.

Cita Chicago Style (17a ed.)

Mayer, Hans Eberhard, y John Gillingham. The Crusades. 2nd ed. Oxford [etc.]: Oxford University Press, 1988.

Cita MLA (9a ed.)

Mayer, Hans Eberhard, y John Gillingham. The Crusades. 2nd ed. Oxford University Press, 1988.