1. Beardsley, J.P. A Report of a Study of Age Conversion Factors to the Research Committee of the American Jersey Cattle Club, (Mimeo.) 1952.
2. Castle, O.M. Memo on Age Corrections in Sire Survey Work in New Zealand. (Mimeo.) 1953.
3. Estimates of Producing Ability in Dairy Cattle;Dickerson;J. Agr. Research,1940
4. The Effect of Age and Dry Period on the Production at Different Levels of Producing Ability;Dickerson,1939
5. Age, Live Weight, and Milk Energy Yield In Illinois Cows;Gaines;,J. Dairy Sci.,1940