APA (7th ed.) Citation

Maran, S. P., & Sagan, C. (1992). The Astronomy and astrophysics encyclopedia. Van Nostrand Reinhold.

Chicago Style (17th ed.) Citation

Maran, Stephen P., and Carl Sagan. The Astronomy and Astrophysics Encyclopedia. New York: Van Nostrand Reinhold, 1992.

MLA (8th ed.) Citation

Maran, Stephen P., and Carl Sagan. The Astronomy and Astrophysics Encyclopedia. Van Nostrand Reinhold, 1992.