KROENKE, D. M., & DOLAN, K. A. (1989). Business coomputer systems: An introduction. -- 3rd ed. McGraw-Hill.

KROENKE, David M., and Kathleen A. DOLAN. Business Coomputer Systems: An Introduction. -- 3rd Ed. New York: McGraw-Hill, 1989.

KROENKE, David M., and Kathleen A. DOLAN. Business Coomputer Systems: An Introduction. -- 3rd Ed. McGraw-Hill, 1989.