Copland, J. W. (1985). Draught animal power for production. Australian Centre for International Agricultural Research.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रCopland, J. W. Draught Animal Power for Production. Canberra, A.C.T: Australian Centre for International Agricultural Research, 1985.
एमएलए (9वां संस्करण) प्रशस्ति पत्रCopland, J. W. Draught Animal Power for Production. Australian Centre for International Agricultural Research, 1985.
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