Miskelly, C.M.; Dowding, J.E.; Elliot, G.P.; Hitchmough, R.A.; Powlesland, R.G.; Robertson, H.A.; Sagar, P.M.; Scofield, R.P.; Taylor, G.A. (2008). "Conservation status of New Zealand birds". Notornis. 55 (3): 117–135. Archived from the original on 9 February 2013. Retrieved 20 May 2012.
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Miskelly, C.M.; Dowding, J.E.; Elliot, G.P.; Hitchmough, R.A.; Powlesland, R.G.; Robertson, H.A.; Sagar, P.M.; Scofield, R.P.; Taylor, G.A. (2008). "Conservation status of New Zealand birds". Notornis. 55 (3): 117–135. Archived from the original on 9 February 2013. Retrieved 20 May 2012.
Robertson, H. A.; Baird, K.; Dowding, J. E.; Elliott, G. P.; Hitchmough, Rod; Miskelly, C. M.; McArthur, N.; O'Donnell, C. F. J.; Sagar, P. M.; Scofield, R. P.; Taylor, G. A. (2017-05-01). "Conservation status of New Zealand birds, 2016". New Zealand Threat Classification Series. 19: 27.