Citazione APA

Fraknoi, A., Morrison, D., & Wolff, S. (2004). Voyages through the universe (3rd ed.). Thomson.

Stile di citazione Chicago

Fraknoi, Andrew, David Morrison, e Sidney Wolff. Voyages Through the Universe. 3rd ed. Belmont, CA: Thomson, 2004.

Citazione MLA

Fraknoi, Andrew, et al. Voyages Through the Universe. 3rd ed. Thomson, 2004.