APA aipamena

Richards, J. C., & Bohlke, D. (2012). Speak now 4: Communicate with confidence. New York: Oxford University Press.

Chicago Style aipamena

Richards, Jack C., và David Bohlke. Speak Now 4: Communicate With Confidence. New York: Oxford University Press, 2012.

MLA aipamena

Richards, Jack C., và David Bohlke. Speak Now 4: Communicate With Confidence. New York: Oxford University Press, 2012.