Coba jelasin Lihat juga dari Parrot Neotropikal dalam bahasa melayu dong

Miyaki, C. Y.; Matioli, S. R.; Burke, T. & Wajntal, A. (1998): Parrot evolution and paleogeographical events: Mitochondrial DNA evidence.  Molecular Biology and Evolution 15: 544-551. PDF fulltext

Ribas, C., R. Gaban-Lima, C. Miyaki, and J. Cracraft (2005). Historical biogeography and diversification within the Neotropical parrot genus Pionopsitta (Aves: Psittacidae). Journal Biogeography 32:1409-1427.

Split Gypopsitta from Pionopsitta South American Classification Committee.