Butlin, R. A., & Roberts, N. (1995). Ecological relations in historical times: Human impact and adaptation. Blackwell.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रButlin, R. A., और Neil Roberts. Ecological Relations in Historical Times: Human Impact and Adaptation. Oxford: Blackwell, 1995.
एमएलए (9वां संस्करण) प्रशस्ति पत्रButlin, R. A., और Neil Roberts. Ecological Relations in Historical Times: Human Impact and Adaptation. Blackwell, 1995.
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