Leo XIII, P. C. C. P. (19). Rerum Novarum- Encyclical Letter of Pope Leo XIII on The Condition of Labor. New York.
Chicago Style aipamenaLeo XIII, Pope; Catholic Church. Pope. Rerum Novarum- Encyclical Letter of Pope Leo XIII on The Condition of Labor. New York, 19.
MLA aipamenaLeo XIII, Pope; Catholic Church. Pope. Rerum Novarum- Encyclical Letter of Pope Leo XIII on The Condition of Labor. New York, 19.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.