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B. Weiler and R. Black, Tour guiding research: insights, issues and implications, vol. 62. Bristol: Channel View Publications, 2015 [Online]. Available: https://ebookcentral.proquest.com/lib/bournemouth-ebooks/detail.action?docID=1790334
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B. Weiler and R. Black, Tour guiding research: insights, issues and implications, vol. Aspects of tourism. Bristol: Channel View Publications, 2014.
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R. Benfield, Garden tourism. Wallingford: CABI, 2013.
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Buckley, Ralf, Environmental impacts of ecotourism, vol. Ecotourism book series. Wallingford: CABI publishing, 2004.
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R. Buckley, Environmental impacts of ecotourism, vol. 2. Wallingford, Oxon, UK: CABI Pub, 2004 [Online]. Available: https://ebookcentral.proquest.com/lib/bournemouth-ebooks/detail.action?docID=297545
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Buckley, Ralf C., Pickering, C., Weaver, David B., and Fenner Conference on Nature Tourism and the Environment, Nature-based tourism, environment and land management, vol. Ecotourism book series. Wallingford: CABI, 2003.
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Duffy, Rosaleen, A trip too far: ecotourism, politics, and exploitation. London: Earthscan Publications, 2002.
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Higginbottom, Karen, Wildlife tourism: impacts, management and planning. Altona, Vic: Common Ground, 2004.
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Higham, James E. S., Critical issues in ecotourism: understanding a complex tourism phenomenon. Amsterdam: Butterworth-Heinemann, 2007.
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Higham, James E. S., Critical issues in ecotourism: understanding a complex tourism phenomenon, 1st ed. Amsterdam: Butterworth-Heinemann, 2007 [Online]. Available: http://search.ebscohost.com/login.aspx?authtype=ip,shib&custid=s7547708&direct=true&db=nlebk&db=nlabk&site=ehost-live&scope=site&AN=196292
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Honey, Martha, Ecotourism and sustainable development: who owns paradise?, 2nd ed. Washington, D.C.: Island Press, 2008 [Online]. Available: http://search.ebscohost.com/login.aspx?authtype=ip,shib&custid=s7547708&direct=true&db=nlebk&db=nlabk&site=ehost-live&scope=site&AN=399207
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Orams, Mark, Marine tourism: development, impacts and management. London: Routledge, 1999.
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Orams, Mark, Marine tourism: development, impacts and management. London: Routledge, 2002 [Online]. Available: http://search.ebscohost.com/login.aspx?authtype=ip,shib&custid=s7547708&direct=true&db=nlebk&db=nlabk&site=ehost-live&scope=site&AN=70436
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Newsome, David, Dowling, Ross Kingston, and Moore, Susan A., Wildlife tourism, vol. Aspects of tourism. Clevedon: Channel View, 2005.
[15]
Wearing, Stephen and Neil, John, Ecotourism: impacts, potentials, and possibilities. Oxford: Butterworth-Heinemann, 1999.
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World Tourism Organization, Industry and Environment Programme Activity Centre, and United Nations, Guidelines: development of national parks and protected areas for tourism, vol. Tourism and the environment. Madrid: WTO, 1992.