Vrat, P., & Sardana, G. S. (1998). Productivity management: A system approach. Narosa Publishing House.
芝加哥风格引文Vrat, Prem, 与 G.D. Sahay Sardana. Productivity Management: A System Approach. New Delhi: Narosa Publishing House, 1998.
MLA引文Vrat, Prem, 与 G.D. Sahay Sardana. Productivity Management: A System Approach. Narosa Publishing House, 1998.
警告：这些引文格式不一定是100％准确.