COMPETITION SUCCESS REVIEW. (1991). GENERAL KNOWLEDGE 1990-91 (122.). COMPETITION REVIEW PVT. LTD.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रCOMPETITION SUCCESS REVIEW. GENERAL KNOWLEDGE 1990-91. 122. NEW DELHI: COMPETITION REVIEW PVT. LTD, 1991.
एमएलए (9वां संस्करण) प्रशस्ति पत्रCOMPETITION SUCCESS REVIEW. GENERAL KNOWLEDGE 1990-91. 122. COMPETITION REVIEW PVT. LTD, 1991.
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