Παραπομπή σε μορφή APA (7η εκδ.)

Abell, G. O., Morrison, D., & Wolff, S. C. (1991). Exploration of the universe (6th Edition, 1993 Version.). Saunders College Publishing.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Abell, George O., David Morrison, και Sidney C. Wolff. Exploration of the Universe. 6th Edition, 1993 Version. Philadelphia: Saunders College Publishing, 1991.

Παραπομπή σε μορφή MLA (8th εκδ.)

Abell, George O., et al. Exploration of the Universe. 6th Edition, 1993 Version. Saunders College Publishing, 1991.