APA (7th ed.) Citation

United States. National Aeronautics and Space Administration. (2012). Why the world didn't end yesterday. National Aeronautics and Space Administration.

Chicago Style (17th ed.) Citation

United States. National Aeronautics and Space Administration. Why the World Didn't End Yesterday. [Washington, D.C.?]: National Aeronautics and Space Administration, 2012.

MLA (9th ed.) Citation

United States. National Aeronautics and Space Administration. Why the World Didn't End Yesterday. National Aeronautics and Space Administration, 2012.