Cita APA (7a ed.)

Duffy, E. (1997). Saints & sinners: A history of the popes. Yale University Press.

Cita Chicago Style (17a ed.)

Duffy, Eamon. Saints & Sinners: A History of the Popes. New Haven: Yale University Press, 1997.

Cita MLA (9a ed.)

Duffy, Eamon. Saints & Sinners: A History of the Popes. Yale University Press, 1997.