Quality Improvement Through Planned Experimentation (Third Edition), Ronald Moen, Thomas Nolan, and Lloyd Provost, McGraw-Hill, NY, 2012

Research Methods in Social Relations, Louise Kidder and Charles Judd, Hold, Rinehart and Winston, (sixth edition) Orlando, FL, 1986

Statistics for Experimenters, George Box, William Hunter, and Stuart Hunter, John Wiley & Sons, NY, 1978