00277nam a2200109Ia 450000500170000004000080001710000200002524500580004525000120010326000390011530000130015420190302141810.0  cAEF1 aNegi, Jagmohan 10aTravel agency & tour operation: concepts & principles  a2nd ed.  bKanishka Publishers, Distributors,  a498 p. :