1. Dickerson, G. E. &Hazel, L. N. (1944). Effectiveness of selection on progeny performances as a supplement to earlier culling of livestock.J. Agric. Res. 69, 459.
2. Johansson, I. &Hansson, A. (1940). Causes of variation in milk and butterfat yield of dairy cows.K. Landtbr Akad. Handl., Stockh.,79, No. 61/2: 127 pp.
3. Lush, J. L. (1935). Progeny test and individual performance as indicators of an animal’s breeding value.J. Dairy Sci. 18, 1.
4. Lush, J. L. (1940). Intra-sire correlation or regression of offspring on dam as a method of estimating heritability of characteristics.Proc. 33rd Ann. Meet. Amer. Soc. Anim. Prod. p. 293.
5. Lush, J. L. (1945).Animal Breeding Plans. 402 pp. Ames, Iowa: The Collegiate Press Inc.