Παραπομπή σε μορφή APA (7η εκδ.)

Leo XIII, P. C. C. P. (19). Rerum Novarum- Encyclical Letter of Pope Leo XIII on The Condition of Labor. New York.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Leo XIII, Pope; Catholic Church. Pope. Rerum Novarum- Encyclical Letter of Pope Leo XIII on The Condition of Labor. New York, 19.

Παραπομπή σε μορφή MLA (8th εκδ.)

Leo XIII, Pope; Catholic Church. Pope. Rerum Novarum- Encyclical Letter of Pope Leo XIII on The Condition of Labor. New York, 19.