APA (7th ed.) Citation

Sayers, J. E., & Settis Frugoni, A. (1997). Innocenzo III (1198-1216) (1. ed.). Viella.

Chicago Style (17th ed.) Citation

Sayers, Jane E., and Andrea Settis Frugoni. Innocenzo III (1198-1216). 1. ed. Roma: Viella, 1997.

MLA (9th ed.) Citation

Sayers, Jane E., and Andrea Settis Frugoni. Innocenzo III (1198-1216). 1. ed. Viella, 1997.