Cita APA (7a ed.)

Clarke, P. D., & Duggan, A. J. (2012). Pope Alexander III (1159-81): The art of survival. Ashgate.

Cita Chicago Style (17a ed.)

Clarke, Peter D., y Anne J. Duggan. Pope Alexander III (1159-81): The Art of Survival. Farnham (England) ; Burlington (USA): Ashgate, 2012.

Cita MLA (9a ed.)

Clarke, Peter D., y Anne J. Duggan. Pope Alexander III (1159-81): The Art of Survival. Ashgate, 2012.