APA (7th ed.) Citation
Illingworth, V. (1979). The Facts on the file dictionary of astronomy. Facts on File.
Chicago Style (17th ed.) Citation
Illingworth, Valerie. The Facts on the File Dictionary of Astronomy. New York: Facts on File, 1979.
MLA (9th ed.) Citation
Illingworth, Valerie. The Facts on the File Dictionary of Astronomy. Facts on File, 1979.
Warning: These citations may not always be 100% accurate.