1. Dodd, F. H. and Griffin, T. K. 1965.Report of the National Institute for Research in Dairying27–28.
2. New Zealand Dairy Board. 1972.48th farm production report (1971 – 72 season)29
3. New Zealand Dairy Board. 1974.50th farm production report (1973 – 74 season)52
4. New Zealand Dairy Board. 1976.52nd farm production report (1975 – 76 season)37