APA (7th ed.) Citation

Ridpath, I. (2003). The monthly sky guide (6th ed.). Cambridge University Press.

Chicago Style (17th ed.) Citation

Ridpath, Ian. The Monthly Sky Guide. 6th ed. New York: Cambridge University Press, 2003.

MLA (9th ed.) Citation

Ridpath, Ian. The Monthly Sky Guide. 6th ed. Cambridge University Press, 2003.