Hertzon, S. (1971). Hospitality industry cooperative training. ITT Educational Services.
Chicago-viite (17. p.)Hertzon, Seymour. Hospitality Industry Cooperative Training. New York: ITT Educational Services, 1971.
MLA-viite (9. p.)Hertzon, Seymour. Hospitality Industry Cooperative Training. ITT Educational Services, 1971.
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