Paul VI, P. (1968). On the regulation of birth = Humanae vitae: Encyclical letter. Washington, D.C..
Chicago (17e ed.) BronvermeldingPaul VI, Pope. On the Regulation of Birth = Humanae Vitae: Encyclical Letter. Washington, D.C., 1968.
MLA (8e ed.) BronvermeldingPaul VI, Pope. On the Regulation of Birth = Humanae Vitae: Encyclical Letter. Washington, D.C., 1968.
Let op: Deze citaties zijn niet altijd 100% accuraat.