Dyfyniad APA

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

Dyfyniad Arddull Chicago

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

Dyfyniad MLA

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

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