Smith, B.T.; Bryson, R.W. Jr; Mauck, W.M.; Chaves, J.; Robbins, M.B.; Aleixo, A.; Klicka, J. (2018). Species delimitation and biogeography of the gnatcatchers and gnatwrens (Aves: Polioptilidae). Molecular Phylogenetics and Evolution. 126: 45—57. doi:10.1016/j.ympev.2018.03.012.