Siguaw, J. A. (2004). Hospitality salesSelling smarter. Thomson-Delmar Learning.
Lua i Stíl Chicago (17ú heag.)Siguaw, Judy A. Hospitality SalesSelling Smarter. Thomson-Delmar Learning, 2004.
Lua MLA (8ú heag.)Siguaw, Judy A. Hospitality SalesSelling Smarter. Thomson-Delmar Learning, 2004.
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