Citazione APA

Seeds, M. a. B. (2012). Horizons: Exploring the universe (12.).

Stile di citazione Chicago

Seeds, Michael and Backman. Horizons: Exploring the Universe. 12. Brooks/Cole, Cengage Learning, 2012.

Citazione MLA

Seeds, Michael and Backman. Horizons: Exploring the Universe. 12. 2012.