APA (7th ed.) Citation

Poupard, P., & Senčík, Š. Populorum progressio.

Chicago Style (17th ed.) Citation

Poupard, Paul, and Štefan Senčík. Populorum Progressio.

MLA (9th ed.) Citation

Poupard, Paul, and Štefan Senčík. Populorum Progressio.

Warning: These citations may not always be 100% accurate.