APA (7th ed.) Citation

Ridpath, I., & Roxburgh, I. W. (1976). The Illustrated encyclopedia of astronomy and space. Crowell.

Chicago Style (17th ed.) Citation

Ridpath, Ian, and Ian W. Roxburgh. The Illustrated Encyclopedia of Astronomy and Space. New York: Crowell, 1976.

MLA (9th ed.) Citation

Ridpath, Ian, and Ian W. Roxburgh. The Illustrated Encyclopedia of Astronomy and Space. Crowell, 1976.