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2. Dickey, D.R. and van Rossem, A.J.V. (1938). The Birds of El Salvador. Field Museum of Natural History (Zoological Series) 23. Chicago.
3. Blake, E. R. (1977). Manual of Neotropical Birds. Volume 1. Spheniscidae (Penguins) to Laridae (Gulls and Allies). University of Chicago Press, Chicago, IL, USA, and London, UK.
4. Ridgway, R., and H. Friedmann (1946). The Birds of North and Middle America. Part X. Cracidae to Meleagrididae. U.S. National Museum Bulletin 50, Smithsonian Institution, Washington, DC, USA.
5. Howell, S. N. G., and S. Webb (1995). A Guide to the Birds of Mexico and Northern Central America. Oxford University Press, New York, NY, USA.