APA (7th ed.) Citation

Bopp, J. (1968). Populorum progressio.

Chicago Style (17th ed.) Citation

Bopp, Jörg. Populorum Progressio. 1968.

MLA (9th ed.) Citation

Bopp, Jörg. Populorum Progressio. 1968.

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