Gaya APA

Ritchie, J, R, B., Crouch, G, I. (2003). The Competitive Destination : A Sustainable Tourism Perspective . United Kingdom: CABI Publishing.

Gaya MLA

Ritchie, J., R., Brent., Crouch, Geoffrey, I.. "The Competitive Destination : A Sustainable Tourism Perspective". United Kingdom: CABI Publishing, 2003. Text.