More suggestions and sources
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Gordon, Elizabeth. Finding our own voice: New Zealand English in the making. Christchurch: Canterbury University Press, 2008.
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Gordon, Elizabeth, and others. New Zealand English: its origins and evolution. Cambridge: Cambridge University Press, 2004.
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Gordon, Elizabeth, and Tony Deverson. New Zealand English and English in New Zealand. Auckland: New House Publishers, 1998.
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Hay, Jennifer, Margaret Maclagan and Elizabeth Gordon. New Zealand English. Edinburgh: Edinburgh University Press, 2008.
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Kortman, Bernd, and E. W. Schneider, eds. A handbook of varieties of English. Berlin: Mouton de Gruyter, 2004.