Reader's Digest Association. (1996). Great mysteries of the 20th century. Reader's Digest.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रReader's Digest Association. Great Mysteries of the 20th Century. Pleasantville: Reader's Digest, 1996.
एमएलए (9वां संस्करण) प्रशस्ति पत्रReader's Digest Association. Great Mysteries of the 20th Century. Reader's Digest, 1996.
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