Literature cited
- Baldwyn , S. P. , Oberholser , H. C. and Worley , L. C. 1931 . Measurements of birds , Scientific Publication of the Cleveland Museum of Natural History 2 165
- Dwight , J. 1925 . The gulls (Laridae) of the World . Bulletin of the American Museum of Natural History , 52 : 63 – 401 .
- Mathews , G. M. 1912 . “The Birds of Australia” , Vol. 2 , 527 London : Witherby .
- Peters , J. L. 1934 . “Checklist of Birds of the World” , Vol. 2 , 401 Cambridge : Harvard U.P. .
- Rao , C. R. 1952 . “Advanced Statistical Methods in Biometric Research” , 390 New York : Wiley .
- Present address: Wildlife Branch, Department of Internal Affairs, Wellington, New Zealand.