Orr, O. H. (1992). Saving American birds: T. Gilbert Pearson and the founding of the Audubon movement. University Press of Florida.
Citace podle Chicago (17th ed.)Orr, Oliver H. Saving American Birds: T. Gilbert Pearson and the Founding of the Audubon Movement. Gainesville: University Press of Florida, 1992.
Citace podle MLA (9th ed.)Orr, Oliver H. Saving American Birds: T. Gilbert Pearson and the Founding of the Audubon Movement. University Press of Florida, 1992.
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