APA Style
National Geographic April 2008. (2008).
:
National Geographic Society.
Chicago Style
National Geographic April 2008.
.
:
National Geographic Society,
2008.
Magazine.
MLA Style
National Geographic April 2008.
.
:
National Geographic Society,
2008.
Magazine.
Turabian Style
National Geographic April 2008.
:
National Geographic Society,
2008.
Magazine.