Naunton, J., & Clark, P. (2000). Clockwise: Upper - intermediate : Teacher's book. New York: Oxford University Press.
Chicago Style aipamenaNaunton, Jon., và Paul Clark. Clockwise: Upper - Intermediate : Teacher's Book. New York: Oxford University Press, 2000.
MLA aipamenaNaunton, Jon., và Paul Clark. Clockwise: Upper - Intermediate : Teacher's Book. New York: Oxford University Press, 2000.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.