Morphometric variation as an indicator of genetic interactions between Black-capped and Carolina chickadees at their contact zone in the Appalachian Mountainsv. 117American Ornithologists’ Union427–444
Sattler, G. D. and Braun, Michael J. 2000. "Morphometric variation as an indicator of genetic interactions between Black-capped and Carolina chickadees at their contact zone in the Appalachian Mountains." The Auk, 117 427–444.