Ribas, Camila C.; Miyaki, Cristina Y. Molecular systematics in Aratinga parakeets: species limits and historical biogeography in the ‘solstitialis’ group, and the systematic position of Nandayus nenday. Molecular Phylogenetics and Evolution. 2004, 30 (3): 663. PMID 15012946. doi:10.1016/S1055-7903(03)00223-9.
Ribas, Camila C.; Miyaki, Cristina Y. Molecular systematics in Aratinga parakeets: species limits and historical biogeography in the ‘solstitialis’ group, and the systematic position of Nandayus nenday. Molecular Phylogenetics and Evolution. 2004, 30 (3): 663. PMID 15012946. doi:10.1016/S1055-7903(03)00223-9.