APA (7th ed.) Citation

Catholic Church. Pope & Carlen, C. (1990). The papal encyclicals. Pierian Press.

Chicago Style (17th ed.) Citation

Catholic Church. Pope and Claudia Carlen. The Papal Encyclicals. Ann Arbor: Pierian Press, 1990.

MLA (9th ed.) Citation

Catholic Church. Pope and Claudia Carlen. The Papal Encyclicals. Pierian Press, 1990.

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