1. Adelman, I., and C.T. Morris. 1967. Society, politics, and economic development: A quantitative approach. Baltimore: Johns Hopkins Press.
2. Aigner, D.J., and A.S. Goldberger (eds.). 1977. Latent variables in socioeconomic models. Amsterdam: North-Holland.
3. Anderson, T.W. 1958. An introduction to multivariate statistical analysis. New York: Wiley.
4. Banks, C. 1954. The factorial analysis of crop productivity: A reexamination of professor Kendall’s data. Journal of the Royal Statistical Society, Series B 16: 100–111.
5. Bartlett, M.S. 1938. Methods of estimating mental factors. Nature 141: 609–610.