Cita APA

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

Citación estilo Chicago

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

Cita MLA

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

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