APA (7th ed.) Citation

Spencer, R. (2007). Religion of peace?: Why Christianity is and Islam isn't. Regnery Pub..

Chicago Style (17th ed.) Citation

Spencer, Robert. Religion of Peace?: Why Christianity Is and Islam Isn't. Washington, DC: Regnery Pub., 2007.

MLA (9th ed.) Citation

Spencer, Robert. Religion of Peace?: Why Christianity Is and Islam Isn't. Regnery Pub., 2007.