↑Livezey, Bradley C.; Zusi, Richard L. (2007). Higher-order phylogeny of modern birds (Theropoda, Aves: Neornithes) based on comparative anatomy. II. Analysis and discussion. Zoological Journal of the Linnean Society. 149 (1): 1—95. doi:10.1111/j.1096-3642.2006.00293.x.
↑Sangster, G.; Braun, E.L.; Johansson, U.S.; Kimball, R.T.; Mayr, G.; Suh, A. (2022). Phylogenetic definitions for 25 higher-level clade names of birds. Avian Research. 13: 100027. doi:10.1016/j.avrs.2022.100027.
↑Prum, Richard O.; Berv, Jacob S.; Dornburg, Alex; Field, Daniel J.; Townsend, Jeffrey P.; Lemmon, Emily Moriarty; Lemmon, Alan R. (2015). A comprehensive phylogeny of birds (Aves) using targeted next-generation DNA sequencing. Nature. 526 (7574): 569—573. Bibcode:2015Natur.526..569P. doi:10.1038/nature15697. ISSN0028-0836. PMID26444237. S2CID205246158.