Παραπομπή APA

Vrat, P. (1998). Productivity management: A systems approach.

Παραπομπή Chicago Style

Vrat, Prem. Productivity Management: A Systems Approach. Narosa Publishing House, New Delhi, 1998.

Παραπομπή MLA

Vrat, Prem. Productivity Management: A Systems Approach. 1998.