1. Bain, J.S. 1956. Barriers to new competition. Cambridge, MA: Harvard University Press.
2. Bain, J.S. 1968. Industrial organization, Revisedth ed. New York: Wiley.
3. Blair, J.M. 1972. Economic concentration. New York: Harcourt, Brace, Jovanovich.
4. Chamberlin, E.H. 1933. The theory of monopolistic competition, 8th ed. Cambridge, MA: Harvard University Press. 1962.
5. Collins, N., and L.E. Preston. 1968. Concentration and price–cost margins in manufacturing industries. Berkeley: University of California Press.