Cita APA (7th ed.)

Evans, D. S. (1968). Observation in modern astronomy. English Universities P..

Cita Chicago (17th ed.)

Evans, David S. Observation in Modern Astronomy. London: English Universities P., 1968.

Cita MLA (8th ed.)

Evans, David S. Observation in Modern Astronomy. English Universities P., 1968.

Atenció: Aquestes cites poden no estar 100% correctes.