APA Style

Roop, P., Roop, C. (2008). Did Columbus really discover America? : and other questions about the Age of Exploration . New York, USA: Scholastic Inc.

MLA Style

Roop, Peter., Roop, Connie. "Did Columbus really discover America? : and other questions about the Age of Exploration". New York, USA: Scholastic Inc, 2008. Text.