Birney, B. G. (2012). School days according to Humphrey. Puffin Books, an imprint of Penguin Group.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रBirney, Betty G. School Days According to Humphrey. New York: Puffin Books, an imprint of Penguin Group, 2012.
एमएलए (8वां संस्करण) प्रशस्ति पत्रBirney, Betty G. School Days According to Humphrey. Puffin Books, an imprint of Penguin Group, 2012.
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