Brown, J. (2020). Once upon a space-time! (First edition.). Crown Books for Young Readers.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रBrown, Jeffrey. Once upon a Space-time! First edition. New York: Crown Books for Young Readers, 2020.
एमएलए (8वां संस्करण) प्रशस्ति पत्रBrown, Jeffrey. Once upon a Space-time! First edition. Crown Books for Young Readers, 2020.
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