Leven, C. L. (1970). A framework for the evaluation of secondary impacts of public investments. s.n.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रLeven, Charles L. A Framework for the Evaluation of Secondary Impacts of Public Investments. [St. Louis]: s.n, 1970.
एमएलए (9वां संस्करण) प्रशस्ति पत्रLeven, Charles L. A Framework for the Evaluation of Secondary Impacts of Public Investments. s.n, 1970.
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