Cita APA (7a ed.)

Abell, G. O. (1984). Realm of the universe. Aunders College Publishing.

Cita Chicago Style (17a ed.)

Abell, George O. Realm of the Universe. Philadelphia: Aunders College Publishing, 1984.

Cita MLA (9a ed.)

Abell, George O. Realm of the Universe. Aunders College Publishing, 1984.