Diagnoses of hybrid hummingbirds (Aves: Trochilidae). 2. Hybrid origin of Eriocnemis soderstromi Butlerv. 109No. 4BIOL SOC WASHINGTON764–769
Graves, Gary R. 1996. "Diagnoses of hybrid hummingbirds (Aves: Trochilidae). 2. Hybrid origin of Eriocnemis soderstromi Butler." Proceedings of the Biological Society of Washington, 109, (4) 764–769.