APA (7th ed.) Citation

Van Roo, W. A. (1957). De sacramentis in genere. Universitatis Gregorianae.

Chicago Style (17th ed.) Citation

Van Roo, William A. De Sacramentis in Genere. Romae: Universitatis Gregorianae, 1957.

MLA (9th ed.) Citation

Van Roo, William A. De Sacramentis in Genere. Universitatis Gregorianae, 1957.