Cita APA (7th ed.)

Leo <Papa, X., & Pius <Papa, X. Rerum novarum: Die Sozialen Enzykliken Leos XIII.und Pius XI. Tyrolia-Verlag.

Cita Chicago (17th ed.)

Leo <Papa, XIII.>, i XI.> Pius <Papa. Rerum Novarum: Die Sozialen Enzykliken Leos XIII.und Pius XI. Innsbruck [u.a.]: Tyrolia-Verlag.

Cita MLA (8th ed.)

Leo <Papa, XIII.>, i XI.> Pius <Papa. Rerum Novarum: Die Sozialen Enzykliken Leos XIII.und Pius XI. Tyrolia-Verlag.