Jackson, J. E. (1981), “Principal Components and Factor Analysis, Part 3: What Is Factor Analysis?” Journal of Quality Technology, 13, 125–130.

Jackson, J. E. (1991), A User’s Guide to Principal Components, New York: John Wiley & Sons.

Kaiser, H. F. (1970), “A Second Generation Little Jiffy,” Psychometrika, 35, 401–415.

Wickens, T. D. (1995), The Geometry of Multivariate Statistics, Hillsdale, NJ: Lawrence Erlbaum Associates.