Παραπομπή APA

Fraknoi, A., & Morrison, D. W. (2000). Voyages to the stars and galaxies (2nd.). Saunders College Publishing.

Παραπομπή Chicago Style

Fraknoi, Andrew, και David Wolff Morrison. Voyages to the Stars and Galaxies. 2nd. New York: Saunders College Publishing, 2000.

Παραπομπή MLA

Fraknoi, Andrew, και David Wolff Morrison. Voyages to the Stars and Galaxies. 2nd. Saunders College Publishing, 2000.