WAHL, S. V. Invesment appraisal and economic evaluation of mining enterprise. Gulf Publication Co.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रWAHL, Siesfried Von. Invesment Appraisal and Economic Evaluation of Mining Enterprise. Gulf Publication Co.
एमएलए (8वां संस्करण) प्रशस्ति पत्रWAHL, Siesfried Von. Invesment Appraisal and Economic Evaluation of Mining Enterprise. Gulf Publication Co.
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