Non-consumptive wildlife-oriented recreation: a conceptual framework. Duffus, D. & Dearden, P Biological Conservation, 53:213–231, 1990.
bibtex   
@article{duffus_non-consumptive_1990,
	title = {Non-consumptive wildlife-oriented recreation: a conceptual framework.},
	volume = {53},
	language = {en},
	journal = {Biological Conservation},
	author = {Duffus, D.A. and Dearden, P},
	year = {1990},
	pages = {213--231},
}

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