Cita APA (7th ed.)

Abell, G. (1964). Explanation of the Universe. Holt, Rinebart and winston.

Cita Chicago (17th ed.)

Abell, George. Explanation of the Universe. USA: Holt, Rinebart and winston, 1964.

Cita MLA (9th ed.)

Abell, George. Explanation of the Universe. Holt, Rinebart and winston, 1964.