APA (7th ed.) Citation

Ridpath, I. (2007). A dictionary of astronomy (2. ed.). Oxford Univ. Press.

Chicago Style (17th ed.) Citation

Ridpath, Ian. A Dictionary of Astronomy. 2. ed. Oxford: Oxford Univ. Press, 2007.

MLA (9th ed.) Citation

Ridpath, Ian. A Dictionary of Astronomy. 2. ed. Oxford Univ. Press, 2007.