* Pope Pius XII, Humani Generis 1950 encyclical* Roberto Masi, "The Credo of Paul VI: Theology of Original Sin and the Scientific Theory of Evolution" (L'Osservatore Romano, 17 April 1969).
* Pope Pius XII, "Humani generis", 1950 encyclical* Roberto Masi, "The Credo of Paul VI: Theology of Original Sin and the Scientific Theory of Evolution" (L'Osservatore Romano, 17 April 1969).