Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (8th ed.)

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