Johnsgard, P. A. (2011). Sandhill and Whooping Cranes: Ancient Voices over America's Wetlands. UNP - Bison Original.
Style de citation Chicago (17e éd.)Johnsgard, Paul A. Sandhill and Whooping Cranes: Ancient Voices over America's Wetlands. Lincoln: UNP - Bison Original, 2011.
Style de citation MLA (8e éd.)Johnsgard, Paul A. Sandhill and Whooping Cranes: Ancient Voices over America's Wetlands. UNP - Bison Original, 2011.
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