APA (7th ed.) Citation

Amy Shields. (2011). National Geographic Readers: Trains. National Geographic Children's Books.

Chicago Style (17th ed.) Citation

Amy Shields. National Geographic Readers: Trains. National Geographic Children's Books, 2011.

MLA (9th ed.) Citation

Amy Shields. National Geographic Readers: Trains. National Geographic Children's Books, 2011.

Warning: These citations may not always be 100% accurate.