Distribution map of  Amazilia viridifrons wagneri
Peterson, AT and Navarro-Siguenza, AG, (2000) A new taxon in the Amazilia viridifrons (Chordata : Aves : Trochilidae) complex of southern Mexico, Proceedings of the Biological Society of Washington, Volume: 113,   Issue: 4,   Pages: 864-870,   Published: dec 29 2000, ISSN: 0006-324X
Cephas