5. The journal of economic history. Wilmington, Del. Economic History Association at the University of Pennsylvania HIST220
7. Business horizons. [New York] : Elsevier Science for the Kelley School of Business at Indiana University BUS100
9. Harvard business review Boston Graduate School of Business Administration, Harvard University. BUS552 BUS100 BUS130 BUS200 BUS304 BUS305 BUS408 BUS424 BUS460
