The Birds of Mexico and Northern Central America, Steve N. G. Howell and Sophie Webb, published in the United States by Oxford University Press Inc. New York.  1995.

The Birds of Tikal, An Annotated Checklist for the Tikal National Park and Peten Guatemala,
Randell A. Beavers, Texas A&M University Press, College Station, Texas. 1992. 

Patterson Field Guide to the Birds of Mexico, Roger Tory Paterson and Edward L. Chalif, Houghton Mifflin Company, Boston. 1973

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