Exploration of the universe /
George O. Abell.
APA Citation
Abell, G. O. (George Ogden). (1982). Exploration of the universe. 4th ed. Philadelphia: Saunders College Pub..
MLA Citation
Abell, George O. (George Ogden), 1927-1983. Exploration of the Universe. 4th ed. Philadelphia: Saunders College Pub., 1982.
Warning: These citations may not always be complete (especially for serials).