APA (7th ed.) Citation

Espenak, F., & Anderson, J. (1999). Total solar eclipse of 2001 June 21. National Aeronautics and Space Administration, Goddard Space Flight Center.

Chicago Style (17th ed.) Citation

Espenak, Fred, and Jay Anderson. Total Solar Eclipse of 2001 June 21. Greenbelt, Md.: National Aeronautics and Space Administration, Goddard Space Flight Center, 1999.

MLA (8th ed.) Citation

Espenak, Fred, and Jay Anderson. Total Solar Eclipse of 2001 June 21. National Aeronautics and Space Administration, Goddard Space Flight Center, 1999.