Ernest Preston Edwards, E., Murrell Butler, E: A Field Guide to the
Birds of Mexico and Adjacent Areas : Belize, Guatemala, and El Salvador,
Third Edition.
Peterson, R.T., Chalif, E.L: A Field Guide to Mexican Birds,
1973. 297 pp.
Howell, N., G., S et al: A Guide to the Birds of Mexico and Northern
Central America, Oxford University Press. May 1995. 851pp.
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