APA Style

National Geographic. (2013). USA: National Geographic Society.

Chicago Style

National Geographic. Vol.223/No.2/February 2013. USA: National Geographic Society, 2013. Books.

MLA Style

National Geographic. Vol.223/No.2/February 2013. USA: National Geographic Society, 2013. Books.

Turabian Style

National Geographic. USA: National Geographic Society, 2013. Books.