Benfield, R. (2013). Garden tourism. CABI.
Buckley, R. (2004). Environmental impacts of ecotourism (Vol. 2) [Electronic resource]. CABI Pub. https://ebookcentral.proquest.com/lib/bournemouth-ebooks/detail.action?docID=297545
Buckley, Ralf. (2004). Environmental impacts of ecotourism: Vol. Ecotourism book series. CABI publishing.
Buckley, Ralf C., Pickering, C., Weaver, David B., & Fenner Conference on Nature Tourism and the Environment. (2003). Nature-based tourism, environment and land management: Vol. Ecotourism book series. CABI.
Duffy, Rosaleen. (2002). A trip too far: ecotourism, politics, and exploitation. Earthscan Publications.
Higginbottom, Karen. (2004). Wildlife tourism: impacts, management and planning. Common Ground.
Higham, James E. S. (2007a). Critical issues in ecotourism: understanding a complex tourism phenomenon. Butterworth-Heinemann.
Higham, James E. S. (2007b). Critical issues in ecotourism: understanding a complex tourism phenomenon (1st ed) [Electronic resource]. Butterworth-Heinemann. 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? (2nd ed) [Electronic resource]. Island Press. 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, & Moore, Susan A. (2005). Wildlife tourism: Vol. Aspects of tourism. Channel View.
Orams, Mark. (1999). Marine tourism: development, impacts and management. Routledge.
Orams, Mark. (2002). Marine tourism: development, impacts and management [Electronic resource]. Routledge. 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 & Neil, John. (1999). Ecotourism: impacts, potentials, and possibilities. Butterworth-Heinemann.
Weiler, B., & Black, R. (2014). Tour guiding research: insights, issues and implications: Vol. Aspects of tourism. Channel View Publications.
Weiler, B., & Black, R. (2015). Tour guiding research: insights, issues and implications (Vol. 62) [Electronic resource]. Channel View Publications. https://ebookcentral.proquest.com/lib/bournemouth-ebooks/detail.action?docID=1790334
World Tourism Organization, Industry and Environment Programme Activity Centre, & United Nations. (1992). Guidelines: development of national parks and protected areas for tourism: Vol. Tourism and the environment. WTO.
