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