Enid Blyton. (1943). The Mystery of the Secret Room. Hodder Children's Books.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रEnid Blyton. The Mystery of the Secret Room. New York: Hodder Children's Books, 1943.
एमएलए (9वां संस्करण) प्रशस्ति पत्रEnid Blyton. The Mystery of the Secret Room. Hodder Children's Books, 1943.
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