1. Acquaah, G., 1987. Genetic and multivariate statistical evaluation of a phenotypic recurrent selection program for recombining erect architecture and large seed size in Paseolus vulgaris L. Ph.D. diss. Michigan State Univ., East Lansing pp 317 (Diss. Abstr. 8807031).
2. Adams, M.W., 1982. Plant architecture and yield breeding. Iowa State Journal of Research. 56 (3): 225–254.
3. Bramel, P.I., P.N., Hinz & D.E., Green, 1984. Use of principal factor analysis in the study of three stem termination types of soybean. Euphytica 33: 387–400.
4. Cattell, R.B., 1965. Factor analysis: An introduction to essentials I: The purpose and underlying models. Biometrics 21: 190–215.
5. Cooley, W.W. & P.R., Lohnes, 1971. Multivariate data analysis. John Wiley & Sons Inc. N.Y.