Birney, B. G. (2014). Secrets according to Humphrey. G.P. Putnam's Sons, An imprint of Penguin Group (USA) Inc..
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रBirney, Betty G. Secrets According to Humphrey. New York, NY: G.P. Putnam's Sons, An imprint of Penguin Group (USA) Inc., 2014.
एमएलए (8वां संस्करण) प्रशस्ति पत्रBirney, Betty G. Secrets According to Humphrey. G.P. Putnam's Sons, An imprint of Penguin Group (USA) Inc., 2014.
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