8H. D. Hopkins, 2003, The response strategies of dominant U.S. firms to Japanese Challengers, Journal of Management,29:5 - 25.
9Michael A. Hitt, R. Duane Ireland, Robert E. Hoskisson, 2005,Strasagic Management: Competitiveness and Globizationg(Concepts) (6th Edition) ,2005 ,a division of Thomson Learning: 101 - 104.