Nature Tourism: Managing for the Environment. Whelan, T. Island Press, Washington, D.C, 1991.
bibtex   
@book{whelan_nature_1991,
	address = {Washington, D.C},
	title = {Nature {Tourism}: {Managing} for the {Environment}},
	language = {en},
	publisher = {Island Press},
	author = {Whelan, T.},
	year = {1991},
}

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