1. Anderson, T.W. (1984).An introduction to multivariate statistical analysis. New York, NY: Wiley.
2. Anderson, T.W., & Rubin, H. (1956). Statistical inference in factor analysis.Proceedings of the Third Berkeley Symposium, 5, 111–150.
3. Apostol, T.M. (1974).Mathematical analysis (2nd ed.). Reading, MA: Addison-Wesley.
4. Mimeo Series;R.E. Bargmann,1957
5. Bartholomew, D.J. (1996). Response to Dr. Maraun's first reply to discussion of his paper.Multivariate Behavioral Research, 31, 631–636.