APA Style
National Geographic Vol. 201, No. 1, January 2002. (2001).
Washington:
National Geographie.
Chicago Style
National Geographic Vol. 201, No. 1, January 2002.
.
Washington:
National Geographie,
2001.
.
MLA Style
National Geographic Vol. 201, No. 1, January 2002.
.
Washington:
National Geographie,
2001.
.
Turabian Style
National Geographic Vol. 201, No. 1, January 2002.
Washington:
National Geographie,
2001.
.