von Hildrbrand, D. (1969). The encyclical humanae vitae: A sign of contradiction. Franciscan Herald Press.
Chicago Style (17th ed.) Citationvon Hildrbrand, Dietrich. The Encyclical Humanae Vitae: A Sign of Contradiction. Chicago: Franciscan Herald Press, 1969.
MLA (9th ed.) Citationvon Hildrbrand, Dietrich. The Encyclical Humanae Vitae: A Sign of Contradiction. Franciscan Herald Press, 1969.
Warning: These citations may not always be 100% accurate.