Fraknoi, A., & Morrison, D. W. (2000). Voyages to the stars and galaxies (2nd.). Saunders College Publishing.
Chicago Style aipamenaFraknoi, Andrew, and David Wolff Morrison. Voyages to the Stars and Galaxies. 2nd. New York: Saunders College Publishing, 2000.
MLA aipamenaFraknoi, Andrew, and David Wolff Morrison. Voyages to the Stars and Galaxies. 2nd. Saunders College Publishing, 2000.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.