C St J Yales. (1992). May I help you: A course for restaurant and bar staff. New York: Prentice-Hall.
Chicago Stili AlıntıC St J Yales. May I Help You: A Course for Restaurant and Bar Staff. New York: Prentice-Hall, 1992.
MLA AlıntıC St J Yales. May I Help You: A Course for Restaurant and Bar Staff. New York: Prentice-Hall, 1992.
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