Catholic Church. (1939). The key of heaven: A prayer book for Catholics. Catholic Publications Press.
Chicago Style (17th ed.) CitationCatholic Church. The Key of Heaven: A Prayer Book for Catholics. New York: Catholic Publications Press, 1939.
MLA (8th ed.) CitationCatholic Church. The Key of Heaven: A Prayer Book for Catholics. Catholic Publications Press, 1939.
Warning: These citations may not always be 100% accurate.