1. Asher, H. B. 1976 Causal modeling. Beverly Hills: SAGE.
2. Bass, B. M. 1981 Stogdill's handbook of leadership: A survey of theory and research. Revised and expanded ed. New York: Free Press.
3. Cartwright, D. 1965 Influence, leadership, control. In J. G. March (Ed.), Handbook of organizations. Rand McNally. Pp. 1-47.
4. Cohen, J., & Cohen, P. 1983 Applied multiple regression/correlation analysis for the behavioral sciences. New Jersey: Lawrence Erlbaum Associates.
5. Etgar, M. 1976 Channel domination and countervailing power in distributive channels. Journal of Marketing Research, 13, 254-262.