APA (7th ed.) Citation

Petrus Guillermus ca. um 1142, Pandulphus Aletrinus, & Přerovský, O. (1978). Liber pontificalis. Libreria Ateneo Salesiano.

Chicago Style (17th ed.) Citation

Petrus Guillermus ca. um 1142, Pandulphus Aletrinus, and Oldřich Přerovský. Liber Pontificalis. Roma: Libreria Ateneo Salesiano, 1978.

MLA (9th ed.) Citation

Petrus Guillermus ca. um 1142, et al. Liber Pontificalis. Libreria Ateneo Salesiano, 1978.

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