APA (7th ed.) Citation

Gregersen, E. (2010). Manned spacelight. Britannica Educational Publishing.

Chicago Style (17th ed.) Citation

Gregersen, Erik. Manned Spacelight. New York: Britannica Educational Publishing, 2010.

MLA (9th ed.) Citation

Gregersen, Erik. Manned Spacelight. Britannica Educational Publishing, 2010.

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