Catholic Church. Pope (1939-1958 : Pius XII), Abbaye Saint-Pierre de Solesmes, & Catholic Church. Pope. (1963). Directives to lay apostles. St. Paul Editions.
Chicago Style (17th ed.) CitationCatholic Church. Pope (1939-1958 : Pius XII), Abbaye Saint-Pierre de Solesmes, and Catholic Church. Pope. Directives to Lay Apostles. [Boston]: St. Paul Editions, 1963.
MLA (8th ed.) CitationCatholic Church. Pope (1939-1958 : Pius XII), et al. Directives to Lay Apostles. St. Paul Editions, 1963.
Warning: These citations may not always be 100% accurate.