Hirsch, R. E. (2021). Living fossils: Survivors from Earth's distant past. Millbrook Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रHirsch, Rebecca E. Living Fossils: Survivors from Earth's Distant Past. Minneapolis, MN: Millbrook Press, 2021.
एमएलए (8वां संस्करण) प्रशस्ति पत्रHirsch, Rebecca E. Living Fossils: Survivors from Earth's Distant Past. Millbrook Press, 2021.
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