Isard, W., & Cumberland, J. (1960). Regional Economic Pianning. Techniques of Analysis for less developed areas: наукове видання.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रIsard, Walter, और JohnH Cumberland. Regional Economic Pianning. Techniques of Analysis for Less Developed Areas: наукове видання. 1960.
एमएलए (9वां संस्करण) प्रशस्ति पत्रIsard, Walter, और JohnH Cumberland. Regional Economic Pianning. Techniques of Analysis for Less Developed Areas: наукове видання. 1960.
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