Foster, D. L. (1991). Sales and marketing for the travel professional. New York: Glencoe.
शिकागो स्टाइल उद्धरणFoster, Dennis L. Sales and Marketing for the Travel Professional. New York: Glencoe, 1991.
एमएलए उद्धरणFoster, Dennis L. Sales and Marketing for the Travel Professional. New York: Glencoe, 1991.
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