„Psittacine”. American Heritage Dictionary of the English Language, Fourth Edition. Houghton Mifflin Company. 2000. Архивирано из оригинала 2007-08-27. г. Приступљено 2007-09-09.
doi.org
Olah, George; Butchart, Stuart H. M.; Symes, Andy; Guzmán, Iliana Medina; Cunningham, Ross; Brightsmith, Donald J.; Heinsohn, Robert (2016). „Ecological and socio-economic factors affecting extinction risk in parrots”. Biodiversity and Conservation (на језику: енглески). 25 (2): 205—223. ISSN0960-3115. S2CID17282072. doi:10.1007/s10531-015-1036-z.
merriam-webster.com
„Psittacine”. Merriam-Webster Online Dictionary. Merriam-Webster, Inc. Приступљено 2007-09-09.
Olah, George; Butchart, Stuart H. M.; Symes, Andy; Guzmán, Iliana Medina; Cunningham, Ross; Brightsmith, Donald J.; Heinsohn, Robert (2016). „Ecological and socio-economic factors affecting extinction risk in parrots”. Biodiversity and Conservation (на језику: енглески). 25 (2): 205—223. ISSN0960-3115. S2CID17282072. doi:10.1007/s10531-015-1036-z.
web.archive.org
„Psittacine”. American Heritage Dictionary of the English Language, Fourth Edition. Houghton Mifflin Company. 2000. Архивирано из оригинала 2007-08-27. г. Приступљено 2007-09-09.
Olah, George; Butchart, Stuart H. M.; Symes, Andy; Guzmán, Iliana Medina; Cunningham, Ross; Brightsmith, Donald J.; Heinsohn, Robert (2016). „Ecological and socio-economic factors affecting extinction risk in parrots”. Biodiversity and Conservation (на језику: енглески). 25 (2): 205—223. ISSN0960-3115. S2CID17282072. doi:10.1007/s10531-015-1036-z.