Παραπομπή σε μορφή APA (7η εκδ.)

Catholic Church. Pope. (1891). Encyclical letter of our Holy Father by divine providence Pope Leo XIII on the condition of labor. Baltimore, MD: John Murphy & Co..

Παραπομπή σε μορφή Chicago (17η εκδ.)

Catholic Church. Pope. Encyclical Letter of Our Holy Father by Divine Providence Pope Leo XIII on the Condition of Labor. Baltimore, MD: John Murphy & Co., 1891.

Παραπομπή σε μορφή MLA (8th εκδ.)

Catholic Church. Pope. Encyclical Letter of Our Holy Father by Divine Providence Pope Leo XIII on the Condition of Labor. Baltimore, MD: John Murphy & Co., 1891.