APA (7e ed.) Bronvermelding

Vrat, P., & Sardana, G. S. (1998). Productivity management: A system approach. Narosa Publishing House.

Chicago (17e ed.) Bronvermelding

Vrat, Prem, en G.D. Sahay Sardana. Productivity Management: A System Approach. New Delhi: Narosa Publishing House, 1998.

MLA (8e ed.) Bronvermelding

Vrat, Prem, en G.D. Sahay Sardana. Productivity Management: A System Approach. Narosa Publishing House, 1998.