APA (7th ed.) Citation

Lyttleton, R. A. (1953). The comets and their origin. University Press.

Chicago Style (17th ed.) Citation

Lyttleton, R. A. The Comets and Their Origin. Cambridge [England]: University Press, 1953.

MLA (9th ed.) Citation

Lyttleton, R. A. The Comets and Their Origin. University Press, 1953.