Gaya APA

Howell, D, W. et al (1999). Discovering destinations : a geography workbook for traveland tourism (4th ed). Upper Saddle River, NJ: Prentice Hall.

Gaya MLA

Howell, David, W.. et al. "Discovering destinations : a geography workbook for traveland tourism". 4th ed Upper Saddle River, NJ: Prentice Hall, 1999. Text.