Royal Geographical Society (Great Britain), Cater, E., & Lowman, G. (1994). Ecotourism: A sustainable option? Wiley.
Chicago Style (17. basım) AtıfRoyal Geographical Society (Great Britain), Erlet Cater, ve Gwen Lowman. Ecotourism: A Sustainable Option? Chichester ; New York: Wiley, 1994.
MLA (8th ed.) AtıfRoyal Geographical Society (Great Britain), et al. Ecotourism: A Sustainable Option? Wiley, 1994.
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