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Eagles, Paul F. J., McCool, Stephen F., Haynes, Christopher D., International Union for Conservation of Nature and Natural Resources, United Nations Environment Programme, and World Tourism Organization. 2002. Sustainable Tourism in Protected Areas: Guidelines for Planning and Management. Vol. World Commission on Protected Areas : best practice protected area guidelines series. Cambridge: IUCN.
Fletcher, John, Alan Fyall, David Gilbert, and Stephen Wanhill. 2013a. Tourism: Principles and Practice. Fifth edition. Harlow: Pearson.
———. 2013b. Tourism: Principles and Practice. Electronic resource. Fifth edition. Harlow: Pearson. https://ebookcentral.proquest.com/lib/bournemouth-ebooks/detail.action?docID=5137777.
Foundation for Environmental Conservation. n.d. ‘Environmental Conservation’. http://atoz.ebsco.com/direct.asp?id=518&ISSN=0376-8929.
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Larrington, Carolyne. 2015. The Land of the Green Man: A Journey through the Supernatural Landscapes of the British Isles. London: I.B. Tauris.
Mason, Peter. 2008a. Tourism Impacts, Planning and Management. 2nd ed. Oxford: Butterworth-Heinemann.
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Mowforth, Martin, and Ian Munt. 2016a. Tourism and Sustainability: Development, Globalisaion and New Tourism in the Third World. Electronic resource. Fourth edition. London: Routledge, Taylor & Francis Group. https://ebookcentral.proquest.com/lib/bournemouth-ebooks/detail.action?docID=4219089.
———. 2016b. Tourism and Sustainability: Development, Globalization and New Tourism in the Third World. Fourth edition. London: Routledge.
Newton, Adrian C., and Elena Cantarello. 2014a. An Introduction to the Green Economy: Science, Systems and Sustainability. London: Routledge.
———. 2014b. An Introduction to the Green Economy: Science, Systems and Sustainability. Electronic resource. Abingdon, Oxon: Routledge. http://lib.myilibrary.com?id=639370.
Page, Stephen. 2009a. Tourism Management: Managing for Change. 3rd ed. Oxford: Butterworth-Heinemann.
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Wall, Geoffrey and Mathieson, Alister. 2006a. Tourism: Change, Impacts, and Opportunities. Electronic resource. 2nd ed. Harlow, England: Pearson Prentice Hall. http://lib.myilibrary.com?id=133376.
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———. 2006b. Sustainable Tourism: Theory and Practice. Electronic resource. Amsterdam: Elsevier Butterworth-Heinemann. http://site.ebrary.com/lib/bournemouth/Top?layout=document&id=10169687.