1. Newberry, J. S., Science ns-10: 299 (1887).
2. Coues, E., Proceedings of the American Association for the Advancemnent of Science, for 1871 20: 278 (1872).
3. Coues E. Key to North American Birds 2: 106 (1884).
4. On a Point in the Mechanism of the Bird's Wing;Proceedings of the Zoological Society,1875
5. Coues, E., American Naturalist 5: 513 (1871).