Walker, J. R. (1999). Introduction to hospitality (2nd ed.). Upper Saddle River, N.J.: Prentice Hall.
Trích dẫn kiểu ChicagoWalker, John R. Introduction to Hospitality. 2nd ed. Upper Saddle River, N.J.: Prentice Hall, 1999.
Deismireacht MLAWalker, John R. Introduction to Hospitality. 2nd ed. Upper Saddle River, N.J.: Prentice Hall, 1999.
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