APA (7th ed.) Citation

Helbling, H. (1967). The second Vatican Council. Orbis. - publ. by the Foreign Policy Research Institute of the University of Pennsylvania.

Chicago Style (17th ed.) Citation

Helbling, Hanno. "The Second Vatican Council." Orbis. - Publ. by the Foreign Policy Research Institute of the University of Pennsylvania 1967.

MLA (8th ed.) Citation

Helbling, Hanno. "The Second Vatican Council." Orbis. - Publ. by the Foreign Policy Research Institute of the University of Pennsylvania, 1967.

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