APA-viite (7. p.)

Seeds, M. A., & Backman, D. E. (2014). Horizons: Exploring the universe (Thirteenth edition, International edition.). Brooks/Cole, Cengage Learning.

Chicago-viite (17. p.)

Seeds, Michael A., ja Dana E. Backman. Horizons: Exploring the Universe. Thirteenth edition, International edition. Australia: Brooks/Cole, Cengage Learning, 2014.

MLA-viite (9. p.)

Seeds, Michael A., ja Dana E. Backman. Horizons: Exploring the Universe. Thirteenth edition, International edition. Brooks/Cole, Cengage Learning, 2014.