APA (7th ed.) Citation

Christian, C., & Roy, J. (2017). A question and answer guide to astronomy (Second edition.). University Press.

Chicago Style (17th ed.) Citation

Christian, Carol, and Jean-René Roy. A Question and Answer Guide to Astronomy. Second edition. Cambridge: University Press, 2017.

MLA (9th ed.) Citation

Christian, Carol, and Jean-René Roy. A Question and Answer Guide to Astronomy. Second edition. University Press, 2017.