Cita APA (7a ed.)

ABELL, G. O. Realm of The Universe#George O. Abell. Saunders College Publishing.

Cita Chicago Style (17a ed.)

ABELL, George O. Realm of The Universe#George O. Abell. Saunders College Publishing.

Cita MLA (8a ed.)

ABELL, George O. Realm of The Universe#George O. Abell. Saunders College Publishing.