Ecotourism in National Parks: Impacts and Benefits. Duff, L. In National Parks Journal(June), pages 18–20. 1993.
bibtex   
@incollection{duff_ecotourism_1993,
	title = {Ecotourism in {National} {Parks}: {Impacts} and {Benefits}.},
	language = {en},
	booktitle = {National {Parks} {Journal}({June})},
	author = {Duff, L.},
	year = {1993},
	pages = {18--20},
}

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