Faust, D. R. (2020). Layers of stone: How Earth's biggest caves formed (First edition.). PowerKids Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रFaust, Daniel R. Layers of Stone: How Earth's Biggest Caves Formed. First edition. New York: PowerKids Press, 2020.
एमएलए (8वां संस्करण) प्रशस्ति पत्रFaust, Daniel R. Layers of Stone: How Earth's Biggest Caves Formed. First edition. PowerKids Press, 2020.
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