APA Style
National Geographic May 2009. (2009).
:
National Geographic Society.
Chicago Style
National Geographic May 2009.
May 2009.
:
National Geographic Society,
2009.
Book - Paperback.
MLA Style
National Geographic May 2009.
May 2009.
:
National Geographic Society,
2009.
Book - Paperback.
Turabian Style
National Geographic May 2009.
:
National Geographic Society,
2009.
Book - Paperback.