1. Asana, R. D. & V. S. Mani, 1958. Analysis of drought resistance in crop plants. II. The influence of soil drought on the relation between yield and ear characters in wheat (field experiments). Indian J. Genet. 18: 187–198.
2. Dewey, D. R. & K. H. Lu, 1959. A correlation and path coefficient analysis of components of crested wheatgrass seed production. Agron. J. 51: 515–518.
3. Fisher, R. A., 1963. Statistical methods for research workers. 13th. Edn., Oliver & Boyd, London.
4. Li, C. C., 1948. An introduction to population genetics. National Peking University Press, Peking, p. 152–176.
5. Li, C. C., 1956. The concept of path coefficient and its impact on population genetics. Biometrics 12: 190–210.