APA Style
National Geographic - January 2016. (2016).
USA:
.
Chicago Style
National Geographic - January 2016.
January 2016.
USA:
,
2016.
Electronic Resource.
MLA Style
National Geographic - January 2016.
January 2016.
USA:
,
2016.
Electronic Resource.
Turabian Style
National Geographic - January 2016.
USA:
,
2016.
Electronic Resource.