Cracraft, J. 1987. DNA hybridization and avian phylogenetics. Evolutionary Biology 12: 47-96 [Zimmer, J.T. 1926. Catalogue of the Edward E. Ayer Ornithological Library.
Field Museum of Natural History Publications, Zoological Series 16: 1–364 (Pt 1, Publ. 239), 365–706 (Pt 2, Publ. 240)]