TATA SERVICES LIMITED. (1989). STATISTICAL OUTLINE OF INDIA 1989-90. TATA SERVICES LIMITED.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रTATA SERVICES LIMITED. STATISTICAL OUTLINE OF INDIA 1989-90. BOMBAY: TATA SERVICES LIMITED, 1989.
एमएलए (9वां संस्करण) प्रशस्ति पत्रTATA SERVICES LIMITED. STATISTICAL OUTLINE OF INDIA 1989-90. TATA SERVICES LIMITED, 1989.
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