APA (7th ed.) Citation

Porter, J. G., & Moore, P. Yearbook of astronomy. W. W. Norton.

Chicago Style (17th ed.) Citation

Porter, John Guy, and Patrick Moore. Yearbook of Astronomy. New York: W. W. Norton.

MLA (9th ed.) Citation

Porter, John Guy, and Patrick Moore. Yearbook of Astronomy. W. W. Norton.