Coyle, D. C. (1957). Conservation, an American story of conflict and accomplishment. Rutgers University Press.
Citace podle Chicago (17th ed.)Coyle, David Cushman. Conservation, an American Story of Conflict and Accomplishment. New Brunswick, N.J.: Rutgers University Press, 1957.
Citace podle MLA (8th ed.)Coyle, David Cushman. Conservation, an American Story of Conflict and Accomplishment. Rutgers University Press, 1957.
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