Economic benefits of sport fishing and angler wildlife watching in Pennsylvania. Upneja, A. & Shafer, E. Journal of Travel Research, 40:68–78, 2001.
bibtex   
@article{upneja_economic_2001,
	title = {Economic benefits of sport fishing and angler wildlife watching in {Pennsylvania}.},
	volume = {40},
	language = {it},
	journal = {Journal of Travel Research},
	author = {Upneja, A. and Shafer, E.L.},
	year = {2001},
	pages = {68--78},
}

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