Swan, M., & Walter, C. (1990). C - The new cambridge English course: Michael Swan, Catherine Walter. New York: Cambridge University Press.
Chicago Style aipamenaSwan, Michael, và Catherine Walter. C - The New Cambridge English Course: Michael Swan, Catherine Walter. New York: Cambridge University Press, 1990.
MLA aipamenaSwan, Michael, và Catherine Walter. C - The New Cambridge English Course: Michael Swan, Catherine Walter. New York: Cambridge University Press, 1990.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.