APA (7th ed.) Citation

Facts on File, Inc, & Illingworth, V. (1994). The Facts on File dictionary of astronomy (3rd ed.). Facts on File.

Chicago Style (17th ed.) Citation

Facts on File, Inc, and Valerie Illingworth. The Facts on File Dictionary of Astronomy. 3rd ed. New York: Facts on File, 1994.

MLA (9th ed.) Citation

Facts on File, Inc, and Valerie Illingworth. The Facts on File Dictionary of Astronomy. 3rd ed. Facts on File, 1994.