Gregory, J. (2013). Working dogs. Children's Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रGregory, Josh. Working Dogs. New York: Children's Press, 2013.
एमएलए (8वां संस्करण) प्रशस्ति पत्रGregory, Josh. Working Dogs. Children's Press, 2013.
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