Amy Shields. (2011). National Geographic Readers: Trains. National Geographic Children's Books.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रAmy Shields. National Geographic Readers: Trains. National Geographic Children's Books, 2011.
एमएलए (9वां संस्करण) प्रशस्ति पत्रAmy Shields. National Geographic Readers: Trains. National Geographic Children's Books, 2011.
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