Kopas, P. S. (2007). Taking the air: Ideas and change in Canada's national parks. UBC Press.
Chicago Style (17. basım) AtıfKopas, Paul Sheldon. Taking the Air: Ideas and Change in Canada's National Parks. Vancouver: UBC Press, 2007.
MLA (9th ed.) AtıfKopas, Paul Sheldon. Taking the Air: Ideas and Change in Canada's National Parks. UBC Press, 2007.
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