H.  Koenig, Johnson, J. L., and Brown, J. R., ?The Bases of Marketing Channel Power:  An Exploration and Confirmation of Their Underlying Dimensions?, AMA Summer Educators' Conference. Washington, D.C., 1985.

H.  Koenig, Kroeten, T. T., and Brown, J. R., ?The Bases of Power:  Their Effect Upon Retailer's Perceptions of Uncertainty?, AMA Summer Educators' Conference. Chicago, IL, 1984.