Attributes / relations provided by
♦ ¹FORAGING ECOLOGY OF THE RED-CROWNED PARAKEET (CYANORAMPHUS NOVAEZELANDIAE NOVAEZELANDIAE) AND YELLOW-CROWNED PARAKEET (C. AURICEPS AURICEPS) ON LITTLE BARRIER ISLAND, HAURAKI GULF, NEW ZEALAND, Terry C. Greene, New Zealand Journal of Ecology (1998) 22(2): 161-171
♦ ²del Hoyo, J., Elliott, A., Sargatal, J., Christie, D.A. & de Juana, E. (eds.). Handbook of the Birds of the World Alive. Lynx Edicions, Barcelona.