Cita APA

ABELL, G. O. (1980). Realm of the universe.-- Ed.2. Saunders College.

Citación estilo Chicago

ABELL, George O. Realm of the Universe.-- Ed.2. Philadelphia: Saunders College, 1980.

Cita MLA

ABELL, George O. Realm of the Universe.-- Ed.2. Saunders College, 1980.

Warning: These citations may not always be 100% accurate.