Orton, James (February 1871). "Notes on Some Birds in the Museum of Vassar College". The American Naturalist. 4 (12): 711–717. doi:10.1086/270681. JSTOR2447029. S2CID83503957.
Brightsmith, Donald J. (January 2005). "Competition, Predation and Nest Niche Shifts among Tropical Cavity Nesters: Phylogeny and Natural History Evolution of Parrots (Psittaciformes) and Trogons (Trogoniformes)". Journal of Avian Biology. 36 (1): 64–73. doi:10.1111/j.0908-8857.2005.03310.x. JSTOR3677542.
Orton, James (February 1871). "Notes on Some Birds in the Museum of Vassar College". The American Naturalist. 4 (12): 711–717. doi:10.1086/270681. JSTOR2447029. S2CID83503957.
Brightsmith, Donald J. (January 2005). "Competition, Predation and Nest Niche Shifts among Tropical Cavity Nesters: Phylogeny and Natural History Evolution of Parrots (Psittaciformes) and Trogons (Trogoniformes)". Journal of Avian Biology. 36 (1): 64–73. doi:10.1111/j.0908-8857.2005.03310.x. JSTOR3677542.
Herrera, Néstor; Rivera, Roberto; Ibarra Portillo, Ricardo; Rodríguez, Wilfredo (2006). "Nuevos registros para la avifauna de El Salvador"(PDF). Boletín de la Sociedad Antioqueña de Ornitología (in Spanish). 16 (2): 1–19.
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Orton, James (February 1871). "Notes on Some Birds in the Museum of Vassar College". The American Naturalist. 4 (12): 711–717. doi:10.1086/270681. JSTOR2447029. S2CID83503957.