DeLucca, E.J., L.R. Shirley and C. Lanier. "Karyotype Studies in Twenty-two Species of Parrots (Psittaciformes: Aves)," Revista Brasileira de Genetica, 14 (1991): 73-98 (mentions Tui and canary wing).
Gilardi, K.V., L.J. Lowenstine, J.D. Gilardi, and C.A. Munn. "A survey for selected viral, chlamydial, and parasitic diseases in wild dusky-headed parakeets (aratinga weddellii) and tui parakeets (Brotogeris sanctithomae) in Peru," Journal of Wildlife Diseases, 31 (Oct. 1995): 523-528.
Gilardi, K.V.K.; L.J. Lowenstine, and C. Munn "Viral Diseases in Free-Ranging Dusky-Headed Parakeets (Aratinga-Weddellii) and Tui Parakeets (Brotogeris sanctithomae) in Peru," American Association of Zoo Veterinarians and Association of Reptilian and Amphibian Veterinarians Annual Conference. Proceedings., 1994, p. 140-141.
Harris, Robbie. "The First U.S. Breeding of the Tui Parakeet," ASA Avicultural Bulletin (Dec. 1992): 10,12-15.
