APA (7th ed.) Citation

De Mattei, R. (2004). Pius IX (1. publ.). Gracewing.

Chicago Style (17th ed.) Citation

De Mattei, Roberto. Pius IX. 1. publ. Leominster: Gracewing, 2004.

MLA (9th ed.) Citation

De Mattei, Roberto. Pius IX. 1. publ. Gracewing, 2004.

Warning: These citations may not always be 100% accurate.