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