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