___ ( 1985 ). Quality Improvement through Defect Prevention: The Individual's Role , Philip Crosby Associates, Inc., Winter Park, FL.
Gulezian, R. ( 1990 “91 ). Process Control: Statistical Principles and Tools , Quality Alert, New York.
Juran, J.M. and Godfrey, A.B. ( 1999 ). Juran's Quality Handbook , 5th ed., McGraw-Hill, New York.
Juran, J.M. and Gryna, F.M. ( 1993 ). Quality Planning and Analysis , 3rd ed., McGraw-Hill, New York.
MacDonald, J. and Piggot, J. ( 1993 ). Global Quality: The New Management Culture , Toppan Company, Singapore.
Scherkenbach, W.W. ( 1988 ). The Deming Route to Quality and Productivity: Road Maps and Roadblocks , CEEP Press and Quality Press, Washington, D.C. and Milwaukee, WI.