Cita APA

Nicolson, I., & Davies, G. C. (1971). Astronomy. Grosset & Dunlap.

Citación estilo Chicago

Nicolson, Iain, y Gordon C. Davies. Astronomy. New York: Grosset & Dunlap, 1971.

Cita MLA

Nicolson, Iain, y Gordon C. Davies. Astronomy. Grosset & Dunlap, 1971.