1. Stage-Gate Systems: A New Tool for Managing New Products;Cooper;Business Horizons,1990
2. Business Planning in the Eighties: The New Marketing Shape of North American Corporations,1985
3. New Product Management for the 1980s;Booz-Allen & Hamilton,1982
4. New Products Winners and Losers;Hopkins;The Conference Board Report no. 773,1980
5. Winning at New Products;Cooper,1986