Paul VI, P. (1968). Humanae Vitae: Pope Paul's encyclical on birth control. New Haven, Conn..
Dyfyniad Arddull ChicagoPaul VI, Pope. Humanae Vitae: Pope Paul's Encyclical on Birth Control. New Haven, Conn., 1968.
Dyfyniad MLAPaul VI, Pope. Humanae Vitae: Pope Paul's Encyclical on Birth Control. New Haven, Conn., 1968.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.