Ekelund, R. B., & Hébert, R. F. (1990). A history of economic theory and method (3rd ed.). McGraw-Hill.

Ekelund, Robert B., and Robert F. Hébert. A History of Economic Theory and Method. 3rd ed. New York: McGraw-Hill, 1990.

Ekelund, Robert B., and Robert F. Hébert. A History of Economic Theory and Method. 3rd ed. McGraw-Hill, 1990.