APA (7th ed.) Citation

Harper, M. (2009). A Look at "National Geographic United States" and "World Atlases".

Chicago Style (17th ed.) Citation

Harper, Meghan. A Look at "National Geographic United States" and "World Atlases". 2009.

MLA (9th ed.) Citation

Harper, Meghan. A Look at "National Geographic United States" and "World Atlases". 2009.

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