@article {36400,
	title = {External influences and threats to freshwater ecosystems},
	volume = {Heritage Resources centre Occasional Paper 11},
	year = {1989},
	note = {In: D. C. Harvey, S. J. Woodley and A. R. Haworth (eds) Use and management of aquatic resources in Canada{\textquoteright}s national parks},
	pages = {67-76},
	institution = {University of Waterloo},
	author = {Donald, D. B.}
}
