APA (7th ed.) Citation

Tillich, P. (1951). The Protestant era. Nisbet.

Chicago Style (17th ed.) Citation

Tillich, Paul. The Protestant Era. London: Nisbet, 1951.

MLA (8th ed.) Citation

Tillich, Paul. The Protestant Era. Nisbet, 1951.

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