APA (7th ed.) Citation

Ryan, K., & Ryan, M. (1998). Why I am still a Catholic. Riverhead Books.

Chicago Style (17th ed.) Citation

Ryan, Kevin, and Marilyn Ryan. Why I Am Still a Catholic. New York: Riverhead Books, 1998.

MLA (9th ed.) Citation

Ryan, Kevin, and Marilyn Ryan. Why I Am Still a Catholic. Riverhead Books, 1998.