Saints and sinners : a history of the popes.

MLA

Duffy, Eamon. Saints and Sinners : a History of the Popes. New Haven: Yale university, 1997.

APA

Duffy, E. (1997). Saints and sinners : a history of the popes. New Haven: Yale university.

Chicago

Duffy, Eamon Saints and Sinners : a History of the Popes. New Haven: Yale university, 1997.