References

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Gill, B (2010) Checklist of the birds of New Zealand and the Ross Dependency, Antarctica. Ornithological Society of New Zealand Checklist Committee. Pp. 284–286.

Holdaway, R N, Worthy, T H and Tennyson, A J D (2001) 'A working list of breeding bird species of the New Zealand region at first human contact', New Zealand Journal of Zoology, 28: 2, Pp. 119–187.

Medway, David G (2004): Taxonomic status of the Stephens Island piopio (Turnagra capensis). Notornis 51(4): 231–232

Oliver, W R B (1955) New Zealand birds. A H and A W Reed, Wellington.

Potts, T H (1873) Notes on Keropia crassirostris, Gml. (“Piopio”). Journal of the Linnean Society of London, Zoology. 11(56):505–508.

Tennyson, A and Martinson, P 2006 Extinct birds of New Zealand. Wellington, New Zealand: Te Papa Press. P. 128

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