Theil, H. (1974). Liner aggregation of economic relations. North-Holland Pub.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रTheil, H. Liner Aggregation of Economic Relations. North-Holland Pub, 1974.
एमएलए (9वां संस्करण) प्रशस्ति पत्रTheil, H. Liner Aggregation of Economic Relations. North-Holland Pub, 1974.
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