1Bowen, H.P. & Wiersema, M. International and Product Diversification: Their Interrelation- ship and Impact on Firm Performance, Discussion Paper Series 2009-04, McColl School of Business, Queens University of Charlotte, 2009.
2Thomas, D., & Eden, L. What is the shape of the multinationality-performance relationship? Multinational Business Review, 2004,12(1):89-99.