1.
Weiler, B. & Black, R. Tour guiding research: insights, issues and implications. vol. 62 (Channel View Publications, 2015).
2.
Weiler, B. & Black, R. Tour guiding research: insights, issues and implications. vol. Aspects of tourism (Channel View Publications, 2014).
3.
Benfield, R. Garden tourism. (CABI, 2013).
4.
Buckley, Ralf. Environmental impacts of ecotourism. vol. Ecotourism book series (CABI publishing, 2004).
5.
Buckley, R. Environmental impacts of ecotourism. vol. 2 (CABI Pub, 2004).
6.
Buckley, Ralf C., Pickering, C., Weaver, David B., & Fenner Conference on Nature Tourism and the Environment. Nature-based tourism, environment and land management. vol. Ecotourism book series (CABI, 2003).
7.
Duffy, Rosaleen. A trip too far: ecotourism, politics, and exploitation. (Earthscan Publications, 2002).
8.
Higginbottom, Karen. Wildlife tourism: impacts, management and planning. (Common Ground, 2004).
9.
Higham, James E. S. Critical issues in ecotourism: understanding a complex tourism phenomenon. (Butterworth-Heinemann, 2007).
10.
Higham, James E. S. Critical issues in ecotourism: understanding a complex tourism phenomenon. (Butterworth-Heinemann, 2007).
11.
Honey, Martha. Ecotourism and sustainable development: who owns paradise? (Island Press, 2008).
12.
Orams, Mark. Marine tourism: development, impacts and management. (Routledge, 1999).
13.
Orams, Mark. Marine tourism: development, impacts and management. (Routledge, 2002).
14.
Newsome, David, Dowling, Ross Kingston, & Moore, Susan A. Wildlife tourism. vol. Aspects of tourism (Channel View, 2005).
15.
Wearing, Stephen & Neil, John. Ecotourism: impacts, potentials, and possibilities. (Butterworth-Heinemann, 1999).
16.
World Tourism Organization, Industry and Environment Programme Activity Centre, & United Nations. Guidelines: development of national parks and protected areas for tourism. vol. Tourism and the environment (WTO, 1992).
