Orr, O. H. (1992). Saving American birds: T. Gilbert Pearson and the founding of the Audubon movement. University Press of Florida.

Orr, Oliver H. Saving American Birds: T. Gilbert Pearson and the Founding of the Audubon Movement. Gainesville: University Press of Florida, 1992.

Orr, Oliver H. Saving American Birds: T. Gilbert Pearson and the Founding of the Audubon Movement. University Press of Florida, 1992.