Leo XIII. (1998). Encyclical letter: Libertas Praestantissimum of the Supreme Pontiff Pope Leo XIII on human liberty, June 20, 1888 (Angelus Press Edition, February 1998.). Angelus Press.
Chicago-Zitierstil (17. Ausg.)Leo XIII. Encyclical Letter: Libertas Praestantissimum of the Supreme Pontiff Pope Leo XIII on Human Liberty, June 20, 1888. Angelus Press Edition, February 1998. Kansas City: Angelus Press, 1998.
MLA-Zitierstil (9. Ausg.)Leo XIII. Encyclical Letter: Libertas Praestantissimum of the Supreme Pontiff Pope Leo XIII on Human Liberty, June 20, 1888. Angelus Press Edition, February 1998. Angelus Press, 1998.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.