APA (7th ed.) Citation

Illingworth, V. (1979). The Facts on File dictionary of astronomy. Facts on File.

Chicago Style (17th ed.) Citation

Illingworth, Valerie. The Facts on File Dictionary of Astronomy. New York: Facts on File, 1979.

MLA (9th ed.) Citation

Illingworth, Valerie. The Facts on File Dictionary of Astronomy. Facts on File, 1979.