APA (7th ed.) Citation

Ridpath, I., & Tirion, W. (2006). The monthly sky guide (7th ed.). Cambridge University Press.

Chicago Style (17th ed.) Citation

Ridpath, Ian, and Wil Tirion. The Monthly Sky Guide. 7th ed. Cambridge, UK ; New York: Cambridge University Press, 2006.

MLA (9th ed.) Citation

Ridpath, Ian, and Wil Tirion. The Monthly Sky Guide. 7th ed. Cambridge University Press, 2006.