Cita APA (7th ed.)

Howell, D. W. (1993). Passport: An introduction to the travel and tourism industry (2nd ed.). South-Western Pub.

Cita Chicago (17th ed.)

Howell, David W. Passport: An Introduction to the Travel and Tourism Industry. 2nd ed. Cincinnati, Ohio: South-Western Pub, 1993.

Cita MLA (9th ed.)

Howell, David W. Passport: An Introduction to the Travel and Tourism Industry. 2nd ed. South-Western Pub, 1993.