APA (7th ed.) Citation

United States. National Aeronautics and Space Administration. (2012). Mysteries of the sun. NASA.

Chicago Style (17th ed.) Citation

United States. National Aeronautics and Space Administration. Mysteries of the Sun. [Washington, D.C.?]: NASA, 2012.

MLA (8th ed.) Citation

United States. National Aeronautics and Space Administration. Mysteries of the Sun. NASA, 2012.

Warning: These citations may not always be 100% accurate.