Cita APA (7a ed.)

Powell, J. M. (2007). The crusades, the Kingdom of Sicily, and the Mediterranean. Ashgate.

Cita Chicago Style (17a ed.)

Powell, James M. The Crusades, the Kingdom of Sicily, and the Mediterranean. Aldershot [etc.]: Ashgate, 2007.

Cita MLA (9a ed.)

Powell, James M. The Crusades, the Kingdom of Sicily, and the Mediterranean. Ashgate, 2007.