Howell, D. W. (1989). Passport: An introduction to the travel and tourism industry. South-Western Pub.
Citace podle Chicago (17th ed.)Howell, David W. Passport: An Introduction to the Travel and Tourism Industry. Cincinnati: South-Western Pub, 1989.
Citace podle MLA (9th ed.)Howell, David W. Passport: An Introduction to the Travel and Tourism Industry. South-Western Pub, 1989.
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