Catholic Church. Pope (1878-1903 : Leo XIII) & Leo XIII, P. (1998). Encyclical letter Libertas praestantissimum of the supreme Pontiff Leo XIII: On human liberty, June 20, 1888. Angelus Press.
Chicago-viite (17. p.)Catholic Church. Pope (1878-1903 : Leo XIII) ja Pope Leo XIII. Encyclical Letter Libertas Praestantissimum of the Supreme Pontiff Leo XIII: On Human Liberty, June 20, 1888. Kansas City, Mo.: Angelus Press, 1998.
MLA-viite (8. p.)Catholic Church. Pope (1878-1903 : Leo XIII) ja Pope Leo XIII. Encyclical Letter Libertas Praestantissimum of the Supreme Pontiff Leo XIII: On Human Liberty, June 20, 1888. Angelus Press, 1998.
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