Kean, H. The moment of Greyfriars Bobby: The changing cultural position of animals, 1800-1920 / Hilda Kean. A cultural history of animals in the age of empire.(2007).
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रKean, Hilda. "The Moment of Greyfriars Bobby: The Changing Cultural Position of Animals, 1800-1920 / Hilda Kean." A Cultural History of Animals in the Age of Empire.(2007) .
एमएलए (8वां संस्करण) प्रशस्ति पत्रKean, Hilda. "The Moment of Greyfriars Bobby: The Changing Cultural Position of Animals, 1800-1920 / Hilda Kean." A Cultural History of Animals in the Age of Empire.(2007), .
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