APA引文

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

Chicago Style (17th ed.) Citation

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

MLA引文

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

警告：這些引文格式不一定是100％准確.