APA (7th ed.) Citation

Royal Geographical Society (Great Britain), Cater, E., & Lowman, G. (1994). Ecotourism: A sustainable option? Wiley.

Chicago Style (17th ed.) Citation

Royal Geographical Society (Great Britain), Erlet Cater, and Gwen Lowman. Ecotourism: A Sustainable Option? Chichester ; New York: Wiley, 1994.

MLA (8th ed.) Citation

Royal Geographical Society (Great Britain), et al. Ecotourism: A Sustainable Option? Wiley, 1994.