APA (7e ed.) Bronvermelding

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

Chicago (17e ed.) Bronvermelding

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

MLA (9e ed.) Bronvermelding

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