Cita APA (7a ed.)

Child, J., Kelly, N., & Whittock, M. (1992). The crusades. Heinemann.

Cita Chicago Style (17a ed.)

Child, John, Nigel Kelly, y Martyn Whittock. The Crusades. Oxford [u.a.]: Heinemann, 1992.

Cita MLA (9a ed.)

Child, John, et al. The Crusades. Heinemann, 1992.