APA (7th ed.) Citation

Pablo VI, P. (1968). Populorum progressio. Herder.

Chicago Style (17th ed.) Citation

Pablo VI, Papa. Populorum Progressio. Barcelona: Herder, 1968.

MLA (9th ed.) Citation

Pablo VI, Papa. Populorum Progressio. Herder, 1968.

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