Birney, B. G., & Hollings, H. (2018). The world according to humphrey (Unabridged.). Listening Library.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रBirney, Betty G., और Hal Hollings. The World According to Humphrey. Unabridged. New York: Listening Library, 2018.
एमएलए (8वां संस्करण) प्रशस्ति पत्रBirney, Betty G., और Hal Hollings. The World According to Humphrey. Unabridged. Listening Library, 2018.
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