APA (7th ed.) Citation

Keen, R., Boventer, H., & Baumann, U. (1997). Humanism and the Reformation in Controversy.

Chicago Style (17th ed.) Citation

Keen, Ralph, Hermann Boventer, and Uwe Baumann. Humanism and the Reformation in Controversy. 1997.

MLA (8th ed.) Citation

Keen, Ralph, et al. Humanism and the Reformation in Controversy. 1997.

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