APA (7th ed.) Citation

Robertson, J. M. (1972). A short history of freethought, ancient and modern. Arno Press.

Chicago Style (17th ed.) Citation

Robertson, J. M. A Short History of Freethought, Ancient and Modern. New York: Arno Press, 1972.

MLA (8th ed.) Citation

Robertson, J. M. A Short History of Freethought, Ancient and Modern. Arno Press, 1972.