APA (7th ed.) Citation

George, R. P., & Tollefsen, C. (2008). Embryo: A defense of human life. Doubleday.

Chicago Style (17th ed.) Citation

George, Robert P., and Christopher Tollefsen. Embryo: A Defense of Human Life. New York [etc.]: Doubleday, 2008.

MLA (9th ed.) Citation

George, Robert P., and Christopher Tollefsen. Embryo: A Defense of Human Life. Doubleday, 2008.