GUPTA, R. (2012). ENERGY & ENVIRONMENTAL MANAGEMENT IN METALLURGICAL INDUSTRIES. PHI.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रGUPTA, R.C. ENERGY & ENVIRONMENTAL MANAGEMENT IN METALLURGICAL INDUSTRIES. N DELHI: PHI, 2012.
एमएलए (9वां संस्करण) प्रशस्ति पत्रGUPTA, R.C. ENERGY & ENVIRONMENTAL MANAGEMENT IN METALLURGICAL INDUSTRIES. PHI, 2012.
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