1. Juran, J.M.: Quality Control Handbook, Third edition, McGraw Hill,
ISBN 0-07-033175-8
2. Oakland, John S.: Total Quality Management, Heinemann Professional
Publishing
Ltd, Oxford, England , ISBN 0-434-91479-7
3. Feigenbaum, Armand V.:Total Quality Control, Third edition, McGraw Hill,
ISBN 0-07-020353-9