1. Aldrich, J. W. 1943. Relationships of the Canada Jays in the Northwest. Wilson Bull., 55:217–222, 1 pl., 1 fig.
2. Alexander, G. 1945. Natural hybrids between Dendroica coronata and D. auduboni. Auk, 62: 623–626.
3. Alexander, R. D., and T. E. Moore. 1962. The evolutionary relationships of 17-year and 13-year cicadas, and three new species (Homoptera, Cicadidae, Magi-cicada). Univ. Michigan Mus. Zool., Misc. Publ. 121:59, 1 pl., 10 figs.
4. American Ornithologists’ Union. 1957. Check-list of North American Birds, 5th ed. Baltimore, American Ornithologists’ Union. 691 pp.
5. Anderson, E. 1948. Hybridization of the habitat. Evolution, 2:1–9, 1 fig.