APA (7th ed.) Citation

Moore, P., & Tirion, W. (2002). Astronomy encyclopedia. Oxford.

Chicago Style (17th ed.) Citation

Moore, Patrick, and Wil Tirion. Astronomy Encyclopedia. New York, NY: Oxford, 2002.

MLA (9th ed.) Citation

Moore, Patrick, and Wil Tirion. Astronomy Encyclopedia. Oxford, 2002.