Rich, P. E., & Tussing, A. R. (1973). The national park system in Alaska: An economic impact study. Institute of Social, Economic and Government Research, University of Alaska; [distributed by the University of Washington Press.
Citace podle Chicago (17th ed.)Rich, Pamela E., a Arlon R. Tussing. The National Park System in Alaska: An Economic Impact Study. [College]: Institute of Social, Economic and Government Research, University of Alaska; [distributed by the University of Washington Press, 1973.
Citace podle MLA (8th ed.)Rich, Pamela E., a Arlon R. Tussing. The National Park System in Alaska: An Economic Impact Study. Institute of Social, Economic and Government Research, University of Alaska; [distributed by the University of Washington Press, 1973.
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