Dawson, W. L. (1901). Additional Notes on the Birds of Okanogan (Chelan) County, Washington. Zenodo.
Cita Chicago (17th ed.)Dawson, William Leon. Additional Notes on the Birds of Okanogan (Chelan) County, Washington. Zenodo, 1901.
Cita MLA (9th ed.)Dawson, William Leon. Additional Notes on the Birds of Okanogan (Chelan) County, Washington. Zenodo, 1901.
Atenció: Aquestes cites poden no estar 100% correctes.