Yalden, D. W. The history of British birds. Oxford University Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रYalden, D. W. The History of British Birds. Oxford University Press.
एमएलए (8वां संस्करण) प्रशस्ति पत्रYalden, D. W. The History of British Birds. Oxford University Press.
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