García-Deras, G.M., Cortés-Rodríguez, N., Honey, M., Navarro-Sigüenza, A.G., García-Moreno, J. and Hernández-Baños, B.E. 2008. Phylogenetic relationships within the genus Cynanthus (Aves: Trochilidae), with emphasis on C. doubledayi. Zootaxa. 1742, 1 (Apr. 2008), 61–68. DOI:https://doi.org/10.11646/zootaxa.1742.1.5.