APA (7th ed.) Citation

Harrington, P. S. (2011). Cosmic challenge : the ultimate observing list for amateurs / Philip S. Harrington: The ultimate observing list for amateurs. Cambridge University Press.

Chicago Style (17th ed.) Citation

Harrington, Philip S. Cosmic Challenge : The Ultimate Observing List for Amateurs / Philip S. Harrington: The Ultimate Observing List for Amateurs. Cambridge, UK ; New York: Cambridge University Press, 2011.

MLA (9th ed.) Citation

Harrington, Philip S. Cosmic Challenge : The Ultimate Observing List for Amateurs / Philip S. Harrington: The Ultimate Observing List for Amateurs. Cambridge University Press, 2011.

Warning: These citations may not always be 100% accurate.