Petersen, H. C., & Lewis, W. C. (1994). Managerial economics (Third edition.). Macmillan Pub. Co. : Maxwell Macmillan International ; Maxwell Macmillan Canada, ; Prientice Hall.

Petersen, Harold Craig, and W. Cris Lewis. Managerial Economics. Third edition. New York : Toronto : New Delhi: Macmillan Pub. Co. : Maxwell Macmillan International ; Maxwell Macmillan Canada, ; Prientice Hall, 1994.

Petersen, Harold Craig, and W. Cris Lewis. Managerial Economics. Third edition. Macmillan Pub. Co. : Maxwell Macmillan International ; Maxwell Macmillan Canada, ; Prientice Hall, 1994.