.Hutt, M. D., & .Speh, T. W. (1998). Business Marketing Management: A Strategic View of Industrial and Organizational Markets (6th Ed.). The Dryden Press.

.Hutt, Michael D., and Thomas W. .Speh. Business Marketing Management: A Strategic View of Industrial and Organizational Markets. 6th Ed. Texas: The Dryden Press, 1998.

.Hutt, Michael D., and Thomas W. .Speh. Business Marketing Management: A Strategic View of Industrial and Organizational Markets. 6th Ed. The Dryden Press, 1998.