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Gunn C A, Larsen T R. Illinois Zones of Tourism Potential. College Station, TX: A. T. Kearney Inc., Illinois Bureau of Tourism, 1993.
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Priskin J. Assessment of natural resources for nature-based tourism: The case of the Central Coast Region of Western Australia. Tourism Management, 2001, 22(6): 637-646.
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Margules C R, Usher M B. Criteria used in assessing wildlife conservation potential. Biological Conservation, 1981, 21(2): 79-109.
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Sherry R, Geoffrey W. Evaluating Ecotourism: The case of north Sulawesi, Indonesia. Tourism Management, 1999, 20(6): 673-682.
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Stronza A. Because It Is Ours: Community-based Ecotourism in the Peruvian Amazon