Distribution map of Broad-billed Hummingbird (without Cynanthus doubledayi)   Breeding range  Breeding and wintering range
Neotropical Birds Online
Garcia-Deras, Gabriela M. et. al. (2008) Phylogenetic relationships within the genus Cynanthus (Aves : Trochilidae), with emphasis on C-doubledayi, ZOOTAXA, Issue: 1742, Pages: 61-68, ISSN: 1175-5326
Cephas