1. Certain correlations in the weight and number of eggs and the weight of the fowls, W.;Atwood;Va. Agr. Exp. Sta. Bul.,1923
2. Correlation of Sexual Maturity to Annual Egg Record.;Hays;Poultry Science,1923
3. Hays, P. A., Sanborn, Ruby and James, L. L. Correlation Studies on Winter Fecundity. Mass. Agr. Exp. Sta. Bul. 220, pp. 44-53.
4. Past II—The Nature and Causes of Changes in Egg Weight in Relation to Annual Production in Pullets, Poultry Science, Vol. III, No. 5, pp. 153-172.