Cita APA (7a ed.)

Richter, N. B. (1963). The nature of comets. Mathuen.

Cita Chicago Style (17a ed.)

Richter, Nikolaus B. The Nature of Comets. London: Mathuen, 1963.

Cita MLA (9a ed.)

Richter, Nikolaus B. The Nature of Comets. Mathuen, 1963.