Benfield, Richard. Garden Tourism. Wallingford: CABI, 2013. Print.
Buckley, Ralf. Environmental Impacts of Ecotourism. Ecotourism book series. Wallingford: CABI publishing, 2004. Print.
Buckley, Ralf. Environmental Impacts of Ecotourism. Vol. 2. Wallingford, Oxon, UK: CABI Pub, 2004. Web. <https://ebookcentral.proquest.com/lib/bournemouth-ebooks/detail.action?docID=297545>.
Buckley, Ralf C. et al. Nature-Based Tourism, Environment and Land Management. Ecotourism book series. Wallingford: CABI, 2003. Print.
Duffy, Rosaleen. A Trip Too Far: Ecotourism, Politics, and Exploitation. London: Earthscan Publications, 2002. Print.
Higginbottom, Karen. Wildlife Tourism: Impacts, Management and Planning. Altona, Vic: Common Ground, 2004. Print.
Higham, James E. S. Critical Issues in Ecotourism: Understanding a Complex Tourism Phenomenon. Amsterdam: Butterworth-Heinemann, 2007. Print.
---. Critical Issues in Ecotourism: Understanding a Complex Tourism Phenomenon. 1st ed. Amsterdam: Butterworth-Heinemann, 2007. Web. <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. Ecotourism and Sustainable Development: Who Owns Paradise? 2nd ed. Washington, D.C.: Island Press, 2008. Web. <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. Wildlife Tourism. Aspects of tourism. Clevedon: Channel View, 2005. Print.
Orams, Mark. Marine Tourism: Development, Impacts and Management. London: Routledge, 1999. Print.
---. Marine Tourism: Development, Impacts and Management. London: Routledge, 2002. Web. <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. Ecotourism: Impacts, Potentials, and Possibilities. Oxford: Butterworth-Heinemann, 1999. Print.
Weiler, B., and Rosemary Black. Tour Guiding Research: Insights, Issues and Implications. Vol. 62. Bristol: Channel View Publications, 2015. Web. <https://ebookcentral.proquest.com/lib/bournemouth-ebooks/detail.action?docID=1790334>.
---. Tour Guiding Research: Insights, Issues and Implications. Aspects of tourism. Bristol: Channel View Publications, 2014. Print.
World Tourism Organization, Industry and Environment Programme Activity Centre, and United Nations. Guidelines: Development of National Parks and Protected Areas for Tourism. Tourism and the environment. Madrid: WTO, 1992. Print.
