1. Falconer, D. S., 1981. Introduction to quantitative genetics. 2nd Ed. Longman, London, pp. 340.
2. Townley-Smith, T. F., E. A. Hurd & D. S. McBean, 1973. Techniques of selection for yield in wheat. Proc. 4th Internat. Wheat Genetics Symposium, Missouri Agr. Exp. Sta., Columbia, Mo.