1. American Supplier Institute (1989) QFD Implementation Manual for 3 day workshop ,ASI Dearborn, MI.
2. Andreasen, M.M. and Hein, L. (1992) Integrated Product Development ,IFS Publications Ltd, Bedford, England.
3. Cohen, L. (1988) Quality Functional Deployment: An application perspective from Digital Equipment Corporation. National Productivity Review ,Summer.
4. Clover, V.T. and Basley, H.L. (1984) Business Research Methods ,Grid Publishing Inc. Columbus, Ohio.
5. Desa, S. and Schmitz, J. (1991) The Development and Implementation of a Comprehensive Concurrent Engineering Method: Theory and Application. Proceedings of the Aerospace Technology Conference and Exposition, Long Beach, California, 1991. SAE Technical Paper Series ,37–45.