Reid, W. V., & Miller, K. R. (1989). Keeping options alive: The scientific basis for conserving biodiversity. World Resources Institute.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रReid, Walter V., और Kenton R. Miller. Keeping Options Alive: The Scientific Basis for Conserving Biodiversity. Washington, D.C: World Resources Institute, 1989.
एमएलए (9वां संस्करण) प्रशस्ति पत्रReid, Walter V., और Kenton R. Miller. Keeping Options Alive: The Scientific Basis for Conserving Biodiversity. World Resources Institute, 1989.
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