APA (7th ed.) Citation

Draper, J. W. (1990). History of the conflict between religion and science. Project Gutenberg.

Chicago Style (17th ed.) Citation

Draper, John William. History of the Conflict Between Religion and Science. Champaign, Ill.: Project Gutenberg, 1990.

MLA (9th ed.) Citation

Draper, John William. History of the Conflict Between Religion and Science. Project Gutenberg, 1990.