Brouwer; et al. (2000). "Longevity records for Psittaciformes in captivity". International Zoo Yearbook. 37 (37): 299–316. doi:10.1111/j.1748-1090.2000.tb00735.x.
Emslie, Steven D. (1981). "Birds and prehistoric agriculture: The New Mexican pueblos". Human Ecology. 9 (3): 305–329. doi:10.1007/bf00890740. S2CID154860879.
C. Tiberio; et al. (2006). "Gregarious nesting behaviour of thick-billed parrots (Rhynchopsitta pachyrhyncha) in aspen stands". The Wilson Journal of Ornithology. 118 (2): 237–243. doi:10.1676/05-039.1. S2CID85693361.
Urantowka, A.D.; Strzała, T.; Grabowski, K.A. (2014). "Complete mitochondrial genome of endangered Maroon-fronted Parrot (Rhynchopsitta terrisi) - conspecific relation of the species with Thick-billed Parrot (Rhynchopsitta pachyrhyncha)". Mitochondrial DNA. 25 (6): 424–426. doi:10.3109/19401736.2013.809440. PMID23841618. S2CID7865866.
Emslie, Steven D. (1981). "Birds and prehistoric agriculture: The New Mexican pueblos". Human Ecology. 9 (3): 305–329. doi:10.1007/bf00890740. S2CID154860879.
C. Tiberio; et al. (2006). "Gregarious nesting behaviour of thick-billed parrots (Rhynchopsitta pachyrhyncha) in aspen stands". The Wilson Journal of Ornithology. 118 (2): 237–243. doi:10.1676/05-039.1. S2CID85693361.
Gill, Frank; Donsker, David, eds. (2021). "Parrots, cockatoos". World Bird List Version 11.2. International Ornithologists' Union. Retrieved 22 September 2021.