9B. Fynes and C. Voss, 2002, "The moderating effect of buyer - supplier relationships on quality practices and performance", International Journal of Operations and Production Management , 22(6), pp.589-613.
10E. Anderson and B. Weitz, 1992,"The use of pledges to build and sustain commitment in distribution channels", Journal of Marketing Research, 29(1), pp.85-97.