Benfield, Richard. 2013. Garden Tourism. Wallingford: CABI.
Buckley, Ralf. 2004. Environmental Impacts of Ecotourism. Vol. Ecotourism book series. Wallingford: CABI publishing.
Buckley, Ralf. 2004. Environmental Impacts of Ecotourism. Vol. 2. Wallingford, Oxon, UK: CABI Pub.
Buckley, Ralf C., Pickering, C., Weaver, David B., and Fenner Conference on Nature Tourism and the Environment. 2003. Nature-Based Tourism, Environment and Land Management. Vol. Ecotourism book series. 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. 1st ed. Amsterdam: Butterworth-Heinemann.
Honey, Martha. 2008. Ecotourism and Sustainable Development: Who Owns Paradise? 2nd ed. Washington, D.C.: Island Press.
Newsome, David, Dowling, Ross Kingston, and Moore, Susan A. 2005. Wildlife Tourism. Vol. Aspects of tourism. Clevedon: Channel View.
Orams, Mark. 1999. Marine Tourism: Development, Impacts and Management. London: Routledge.
Orams, Mark. 2002. Marine Tourism: Development, Impacts and Management. London: Routledge.
Wearing, Stephen and Neil, John. 1999. Ecotourism: Impacts, Potentials, and Possibilities. Oxford: Butterworth-Heinemann.
Weiler, B., and Rosemary Black. 2014. Tour Guiding Research: Insights, Issues and Implications. Vol. Aspects of tourism. Bristol: Channel View Publications.
Weiler, B., and Rosemary Black. 2015. Tour Guiding Research: Insights, Issues and Implications. Vol. 62. Bristol: Channel View Publications.
World Tourism Organization, Industry and Environment Programme Activity Centre, and United Nations. 1992. Guidelines: Development of National Parks and Protected Areas for Tourism. Vol. Tourism and the environment. Madrid: WTO.