Cita APA

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

Chicago Style Citation

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

Cita MLA

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