Citace podle APA (7th ed.)

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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