APA Style
National geographic : el nino nature's vicious cycle la nina vol. 195 no.3. (1999).
Washington, D.C:
the National Geographic Society.
Chicago Style
National geographic : el nino nature's vicious cycle la nina vol. 195 no.3.
march 1999.
Washington, D.C:
the National Geographic Society,
1999.
Text.
MLA Style
National geographic : el nino nature's vicious cycle la nina vol. 195 no.3.
march 1999.
Washington, D.C:
the National Geographic Society,
1999.
Text.
Turabian Style
National geographic : el nino nature's vicious cycle la nina vol. 195 no.3.
Washington, D.C:
the National Geographic Society,
1999.
Print.