1. Clyde, Dean J. (1969),Multivariate Analysis of Variance on Large Computers, Miami, Florida; Clye Computing Service.
2. Cooley, W.W. and P.R. Lohnes (1962),Multivariate Procedures for the Behavioral Sciences, New York; Wiley.
3. Kotler, Philip and Sidney J. Levy, “Buying Is Marketing Tooll”Journal of Marketing, Vol. 37, No. 1, January 1973, 4, pp. 45–49.
4. Linder, Staffan Burenstam (1961),An Essay on Trade and Transformation, New York; John Wiley and Sons, Inc., Chapter 2 and 3.
5. Rao, C.R. (1962),Advanced Statistical Methods in Biometric Research, New York; Wiley.