Schuchmann, K.-L., Weller, A.-A., & Jürgens, D. (2016).

Biogeography and taxonomy of racket-tail hummingbirds (Aves: Trochilidae: Ocreatus): evidence for species delimitation from morphology and display behavior

. Zootaxa, 4200(1), 83–108. https://doi.org/10.11646/zootaxa.4200.1.3