Cita APA

Seeds, M. A., & Backman, D. E. (2012). Horizons: Exploring the universe (12th ed.). Brooks/Cole, Cengage Learning.

Citación estilo Chicago

Seeds, Michael A., and Dana E. Backman. Horizons: Exploring the Universe. 12th ed. Australia, United States: Brooks/Cole, Cengage Learning, 2012.

Cita MLA

Seeds, Michael A., and Dana E. Backman. Horizons: Exploring the Universe. 12th ed. Brooks/Cole, Cengage Learning, 2012.