Gladstone, J., & Diemert, K. (2017). When planet Earth was new. Owlkids Books Inc.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रGladstone, James, और Katherine Diemert. When Planet Earth Was New. Toronto, ON ; Berkeley, CA: Owlkids Books Inc, 2017.
एमएलए (8वां संस्करण) प्रशस्ति पत्रGladstone, James, और Katherine Diemert. When Planet Earth Was New. Owlkids Books Inc, 2017.
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