Pierson, M. H. (2015). The secret history of kindness: Learning from how dogs learn (First edition.). W.W. Norton & Company.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रPierson, Melissa Holbrook. The Secret History of Kindness: Learning from How Dogs Learn. First edition. New York: W.W. Norton & Company, 2015.
एमएलए (8वां संस्करण) प्रशस्ति पत्रPierson, Melissa Holbrook. The Secret History of Kindness: Learning from How Dogs Learn. First edition. W.W. Norton & Company, 2015.
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