Anderson T. W. (1984), An Introduction to Multivariate Statistical Analysis New York: John Wiley & Sons, Inc.
Andrews D. F. (1972), "Plots of High-Dimensional Data" Biometrics, 28, 125–136.
Apprey V. and Naik D. N. (1998), "A SAS Program for Testing Multivariate Normality" Preprint, Presented at SESUG'98, Norfolk, Virginia.
Barnett V. and Lewis T. (1994), Outliers in Statistical Data, Third Edition New York: John Wiley & Sons, Inc.
Belsley D. A. , Kuh E. and Welsch R. E. (1980), Regression Diagnostics: Identifying Influential Data and Source of Collinearity, New York: John Wiley & Sons, Inc.
Bose R. C. (1951), Least Square Aspects of the Analysis of Variance, Mimeograph Series No. 9, University of North Carolina, Chapel Hill.