United Nations Economic Commission for Europe. (1981). Environmental Impact Assessment. ELSEVIER.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रUnited Nations Economic Commission for Europe. Environmental Impact Assessment. ELSEVIER, 1981.
एमएलए (8वां संस्करण) प्रशस्ति पत्रUnited Nations Economic Commission for Europe. Environmental Impact Assessment. ELSEVIER, 1981.
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