Amy Shields. (2011). National Geographic Readers: Trains. National Geographic Children's Books.
Chicago Style (17th ed.) CitationAmy Shields. National Geographic Readers: Trains. National Geographic Children's Books, 2011.
MLA (9th ed.) CitationAmy Shields. National Geographic Readers: Trains. National Geographic Children's Books, 2011.
Warning: These citations may not always be 100% accurate.