This article on the Country-Wide Publications site discusses a farmer’s success with Romneys.
This page has information on sheep farming and performance-based selection.
In this brief history of agriculture, R. L. Willham from Iowa State University examines the impact of applying science to modern animal production.
This page from the Rare Breeds Conservation Society estimates the numbers of different sheep breeds.
This page on the New Zealand Sheepbreeders' Association site links to information about the various breeds.
Films and videos about sheep and sheep farming, from NZ On Screen.
Bloomfield, G. T. New Zealand, a handbook of historical statistics. Boston: G. K. Hall, 1984.
Cumberland, Kenneth B. Landmarks. Surry Hills: Reader’s Digest, 1981.
Meadows, Graham. Sheep breeds of New Zealand. Auckland: Reed, 1997.
Wolfe, Richard. A short history of sheep in New Zealand. Auckland: Random House, 2006.