APA (7th ed.) Citation

Carlen, M. C., & Pius, X. (1951). Guide to the documents of Pius XII, 1939-1949. Newman Press.

Chicago Style (17th ed.) Citation

Carlen, Mary Claudia, and XII Pius. Guide to the Documents of Pius XII, 1939-1949. Westminster, Md: Newman Press, 1951.

MLA (8th ed.) Citation

Carlen, Mary Claudia, and XII Pius. Guide to the Documents of Pius XII, 1939-1949. Newman Press, 1951.