Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (8th ed.)

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