Hall, K. Susanna S. (2005), “Do nine-primaried passerines have nine or ten primary feathers? The evolution of a concept”, J. Ornithol.146 (2): 121-126, doi:10.1007/s10336-004-0070-5
Lougheed, Stephen C.; Freeland, Joanna R.; Handford, Paul; Boag, Peter T. (2000), “A Molecular Phylogeny of Warbling-Finches (Poospiza): Paraphyly in a Neotropical Emberizid Genus”, Mol. Phylogenet. Evol.17 (3): 367–378, doi:10.1006/mpev.2000.0843
Klicka, John; Johnson, Kevin P.; Lanyon, Scott M. (2000), “New World nine-primaried oscine relationshups: primaried oscine relationships: constructing a mitochondrial NDA framework”, Auk117 (2): 321–336
Hall, K. Susanna S. (2005), “Do nine-primaried passerines have nine or ten primary feathers? The evolution of a concept”, J. Ornithol.146 (2): 121-126, doi:10.1007/s10336-004-0070-5
Lovette, Irby J.; Pérez-Emán, Jorge. L.; Sullivan, John P.; Banks, Richard C.; et al. (2010), “A comprehensive multilocus phylogeny for the wood-warblers and a revised classification of the Parulidae (Aves)”, Mol. Phylogenet. Evol.57 (2): 753–770
Yuri, Tamaki; Mindell, David P. (2002), “Molecular phylogenetic analysis of Fringillidae, “New World nine-primaried oscines”(Aves: Passeriformes)”, Mol. Phylogenet. Evol.23 (2): 229–243
Lougheed, Stephen C.; Freeland, Joanna R.; Handford, Paul; Boag, Peter T. (2000), “A Molecular Phylogeny of Warbling-Finches (Poospiza): Paraphyly in a Neotropical Emberizid Genus”, Mol. Phylogenet. Evol.17 (3): 367–378, doi:10.1006/mpev.2000.0843