Jackie Gaff. (2003). Stalactites Hang Down: And Other Questions About Caves (I Wonder Why) (I Wonder Why Series). Kingfisher Books.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रJackie Gaff. Stalactites Hang Down: And Other Questions About Caves (I Wonder Why) (I Wonder Why Series). Kingfisher Books, 2003.
एमएलए (9वां संस्करण) प्रशस्ति पत्रJackie Gaff. Stalactites Hang Down: And Other Questions About Caves (I Wonder Why) (I Wonder Why Series). Kingfisher Books, 2003.
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