Παραπομπή APA

Optner, S. L. (1975). System analysis for business management (3rd ed.). Prentice-Hall of India.

Παραπομπή Chicago Style

Optner, Stanford L. System Analysis for Business Management. 3rd ed. New Jersey: Prentice-Hall of India, 1975.

Παραπομπή MLA

Optner, Stanford L. System Analysis for Business Management. 3rd ed. Prentice-Hall of India, 1975.