Singh P N. (2004). Self Development for Sure Success. Bishwanath Singh Trust.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रSingh P N. Self Development for Sure Success. Mumbai: Bishwanath Singh Trust, 2004.
एमएलए (9वां संस्करण) प्रशस्ति पत्रSingh P N. Self Development for Sure Success. Bishwanath Singh Trust, 2004.
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