Cita APA (7th ed.)

Fraknoi, A., Morrison, D., & Wolff, S. (1997). Voyages through the universe. Saunders College.

Cita Chicago (17th ed.)

Fraknoi, Andrew, David Morrison, i Sidney Wolff. Voyages Through the Universe. Fort Worth, Tex: Saunders College, 1997.

Cita MLA (9th ed.)

Fraknoi, Andrew, et al. Voyages Through the Universe. Saunders College, 1997.