1. del Hoyo, J., and N. J. Collar (2014). HBW and BirdLife International Illustrated Checklist of the Birds of the World. Volume 1. Non-passerines. Lynx Edicions, Barcelona, Spain.
2. Dickinson, E. C., and J. V. Remsen, Editors (2013). The Howard and Moore Complete Checklist of the Birds of the World. Fourth edition. Volume 1. Aves Press, Eastbourne, UK.
3. Scofield, R.P. (2005). The supposed Macquarie Island parakeet in the collection of the Canterbury Museum. Notornis 52(2): 117–120.
4. Scofield, R.P. and Stephenson, B. (2013). Birds of New Zealand: A Photographic Guide. Auckland University Press, Auckland, New Zealand.
5. Boon Wee Ming, Daugherty, C.H. and Chambers, G.K. (2001). The Norfolk Island Green Parrot and New Caledonian Red-crowned Parakeet are distinct species. Emu 101(2): 113–121.