ebrary, Inc, Black, R., & Crabtree, A. (2007). Quality assurance and certification in ecotourism. CABI Pub..
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Tohutoru Kātū Chicago (17th ed.)
ebrary, Inc, Rosemary Black, me Alice Crabtree. Quality Assurance and Certification in Ecotourism. Cambridge, MA ; Wallingford: CABI Pub., 2007.
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Tohutoro MLA (9th ed.)
ebrary, Inc, et al. Quality Assurance and Certification in Ecotourism. CABI Pub., 2007.
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