APA (7th ed.) Citation

O'Brien, J. A. An investigation of the Catholic religion. [publisher not identified].

Chicago Style (17th ed.) Citation

O'Brien, John A. An Investigation of the Catholic Religion. [Place of publication not identified]: [publisher not identified].

MLA (8th ed.) Citation

O'Brien, John A. An Investigation of the Catholic Religion. [publisher not identified].

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