References
•1. Falls, J.B., and Kopachena, J.G., 1994.  White-throated Sparrow (Zonotrichia albicollis).  In The Birds of North America. No. 128 (A. Poole and F. Gill, Eds.). Philadelphia:  The Academy of Natural Sciences; Washington, D.C.: The American Ornithhologists’ Union.
•2. Kopachena, J.G., and Falls, J.B., 1993a.  Re-evaluation of morph-specific variations in parental behavior of the White-throated Sparrow.  Wilson Bull. 105: 48-59.
•3. Kopachena, J.G., and Falls, J.B., 1993b.  Aggressive performance as a behavioral correlate of plumage polymorphism in the White-throated Sparrow (Zonotrichia albicollis). Behaviour 124: 249-266.
•4. Lowther, J.K., 1961.  Polymorphism in the White-throated Sparrow, Zonotrichia albicollis (Gmelin).  Can. J. Zool. 39: 281-292.
•5. Thorneycroft, H.B., 1966.  Chromosomal polymorphism in the White-throated Sparrow, Zonotrichia albicollis (Gmelin).  Science 154:  1571-1572.
•6. Thorneycroft, H.B., 1975.  A cytogenetic study of the White-throated Sparrow, Zonotrichia albicollis (Gmelin).  Evolution 29: 611-621.
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