APA (7th ed.) Citation

Action Populaire & Juan XXIII, P. (1963). Encyclique Pacem in terris. SPES.

Chicago Style (17th ed.) Citation

Action Populaire and Papa Juan XXIII. Encyclique Pacem in Terris. [Paris]: SPES, 1963.

MLA (9th ed.) Citation

Action Populaire and Papa Juan XXIII. Encyclique Pacem in Terris. SPES, 1963.

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