Hertzon, S. (1971). Hospitality industry cooperative training. ITT Educational Services.
Chicago-referens (17:e uppl.)Hertzon, Seymour. Hospitality Industry Cooperative Training. New York: ITT Educational Services, 1971.
MLA-referens (9:e uppl.)Hertzon, Seymour. Hospitality Industry Cooperative Training. ITT Educational Services, 1971.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.