- Allard, ~.w. (1960). Principles of Plant Breeding. John Wiley and Sons. Inc, New York.
- Arya. P.S. and Sainy S.S. (1977). Indian J. Hort., 34: 415-422.
- Burton. G.w. (1952). Quantitative Inheritance of Grasses. Proc. VIth IntJ. Grassland Congress 1: 277-283.
- Comstock, R.E. and Robinson H.F. (1952). Genetic Parameters, their Estimation and Significance. Proc. VIth IntI. Grassland Congress 1: 284-291.
- Gopalakrishnan et al. (1984). Indian Cocoa Arecanut Spices J., 8: 72-75.
- Johnson etal. (1955). AgronJ., 47: 314-318.
- Panse, VG. and Sukhatme, P. (1978). Statistical Method for Agricultural Workers, 3ro revised edi. ICAR, New Delhi, pp-70-99.
- Sheela K.B. (1998). Ph.D. Thesis, Kerala Agricultural University, Thrissur.
- Sreelathakumary, I. and Rajamony, L. (2002). Indian J. Hart., 59: 77-83.
- Thompson, C.H. and Kelly, C.N. (1957). Vegetable Crops. Mc.Graw Hill Book Co. Inc. USA, pp 611.