APA (7th ed.) Citation

Weiler, R. (1968). Populorum progressio. Gesellschaft & Politik.

Chicago Style (17th ed.) Citation

Weiler, Rudolf. "Populorum Progressio." Gesellschaft & Politik 1968.

MLA (9th ed.) Citation

Weiler, Rudolf. "Populorum Progressio." Gesellschaft & Politik, 1968.

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