APA (7th ed.) Citation

Van Roo, W. A. (1971). The Mystery. Gregorian University Press.

Chicago Style (17th ed.) Citation

Van Roo, William A. The Mystery. Rome: Gregorian University Press, 1971.

MLA (9th ed.) Citation

Van Roo, William A. The Mystery. Gregorian University Press, 1971.

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