Cita APA (7a ed.)

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

Cita Chicago Style (17a ed.)

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

Cita MLA (8a ed.)

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