Kohler, H. (1968). Scarcity Challenged An Introduction To Economics Heinz Kohler. Holt, Rinehart and Winston.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रKohler, Heinz. Scarcity Challenged An Introduction To Economics Heinz Kohler. Holt, Rinehart and Winston, 1968.
एमएलए (8वां संस्करण) प्रशस्ति पत्रKohler, Heinz. Scarcity Challenged An Introduction To Economics Heinz Kohler. Holt, Rinehart and Winston, 1968.
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