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शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रE., Hammam. Trends in the World Demand for Primary Products & Their Impli-cations for the Exports of De-veloping Countries. Cairo: The Institute of National Planning, 1967.
एमएलए (9वां संस्करण) प्रशस्ति पत्रE., Hammam. Trends in the World Demand for Primary Products & Their Impli-cations for the Exports of De-veloping Countries. The Institute of National Planning, 1967.
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