Certo, S. C. (1992). Modern management: Quality, ethics and the global enviroment (5th ed.). Allyn and bacon.

Certo, Samuel C. Modern Management: Quality, Ethics and the Global Enviroment. 5th ed. Boston: Allyn and bacon, 1992.

Certo, Samuel C. Modern Management: Quality, Ethics and the Global Enviroment. 5th ed. Allyn and bacon, 1992.