Smith, D. G. (2007). English for telephoning. New York: Oxford University Press.
Chicago Style aipamenaSmith, David Gordon. English for Telephoning. New York: Oxford University Press, 2007.
MLA aipamenaSmith, David Gordon. English for Telephoning. New York: Oxford University Press, 2007.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.