C. S. Baker, Chilvers, B. L., Constantine, R., Dufresne, S., Mattlin, R. H., van Helden, A., and Hitchmough, R.,
“Conservation status of New Zealand marine mammals (suborders Cetacea and Pinnipedia), 2009”,
New Zealand Journal of Marine and Freshwater Research, vol. 44, no. 2, pp. 101 - 115, 2010.