APA (7th ed.) Citation

Petrus, C. (1855). Opera omnia. [Verlag nicht ermittelbar].

Chicago Style (17th ed.) Citation

Petrus, Cellensis. Opera Omnia. Parisiis: [Verlag nicht ermittelbar], 1855.

MLA (9th ed.) Citation

Petrus, Cellensis. Opera Omnia. [Verlag nicht ermittelbar], 1855.

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