Foster, D. L. (1995). First Class: An Introduction to Travel and Tourism. Singapore: Glencoe.
शिकागो स्टाइल उद्धरणFoster, Dennis L. First Class: An Introduction to Travel and Tourism. Singapore: Glencoe, 1995.
एमएलए उद्धरणFoster, Dennis L. First Class: An Introduction to Travel and Tourism. Singapore: Glencoe, 1995.
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