Cita APA (7th ed.)

Lundberg, D. E., & Lundberg, C. B. (1993). International travel and tourism (2nd ed.). J. Wiley.

Cita Chicago (17th ed.)

Lundberg, Donald E., i Carolyn B. Lundberg. International Travel and Tourism. 2nd ed. New York: J. Wiley, 1993.

Cita MLA (9th ed.)

Lundberg, Donald E., i Carolyn B. Lundberg. International Travel and Tourism. 2nd ed. J. Wiley, 1993.