APA Style
National Geograpic 4 : February, July, and December 2007 (biding magazines). (2007).
Washington, D.C:
National Geographic Society.
Chicago Style
National Geograpic 4 : February, July, and December 2007 (biding magazines).
.
Washington, D.C:
National Geographic Society,
2007.
Text.
MLA Style
National Geograpic 4 : February, July, and December 2007 (biding magazines).
.
Washington, D.C:
National Geographic Society,
2007.
Text.
Turabian Style
National Geograpic 4 : February, July, and December 2007 (biding magazines).
Washington, D.C:
National Geographic Society,
2007.
Print.