Akers, Kate and Orr-Walker, Tamsin. Kea FactsheetArkivert 2010-06-02 ved Wayback Machine., Kea Conservation Trust, April 2009. Retrieved 22 January 2010.
«Clever clown of the mountains». University of Vienna - Faculty of Life Sciences, Department of Cognitive Biology. Arkivert frå originalen 2. november 2011. Henta 20. oktober 2012.
Akers, Kate and Orr-Walker, Tamsin. Kea FactsheetArkivert 2010-06-02 ved Wayback Machine., Kea Conservation Trust, April 2009. Retrieved 22 January 2010.
«Clever clown of the mountains». University of Vienna - Faculty of Life Sciences, Department of Cognitive Biology. Arkivert frå originalen 2. november 2011. Henta 20. oktober 2012.