APA Style
National Geographic : No.6 (December 2011). (0).
:
.
Chicago Style
National Geographic : No.6 (December 2011).
.
:
,
0.
Magazine.
MLA Style
National Geographic : No.6 (December 2011).
.
:
,
0.
Magazine.
Turabian Style
National Geographic : No.6 (December 2011).
:
,
0.
Magazine.