1. Delbecq , A. L. , Van de Ven , A. , and Gustafson , D. H.Group Techniques for Program Planning A Guide to the Nominal Group and Delphi Processes, Scott, Foreman and Company , Glenview , IL , Figure 3.7 , pp. 67 – 69 ( 1975 ).
2. Electronics Manufacturing Engineering , “ Electronics Industry Analyzed ,” Vol. 6 , No. 3, Society of Manufacturing Engineers , One SME Drive , Dearborn , MI , Third Quarter , p. 5 ( 1991 ).
3. SEMATECH Transparency , “ Economic Importance of the Electronics Industry ,” Austin , TX ( 1991 ) .
4. U.S. Department of Commerce ,Statistical Abstract of the United States( statistics for 1987 ), p. 426 ( 1990a ).