David J. Groggel

Statistics Explained: Basic Concepts and Methods

David J. Groggel, 1987 .

Nonparametric Methods for Quantitative Analysis

David J. Groggel, D. Groggel, 1996, Technometrics.

Practical Nonparametric Statistics

David J. Groggel, D. Groggel, 2000, Technometrics.