Seeds, M. A., & Backman, D. E. (2014). Horizons: Exploring the universe (Thirteenth edition, International edition.). Brooks/Cole, Cengage Learning.
Citace podle Chicago (17th ed.)Seeds, Michael A., a Dana E. Backman. Horizons: Exploring the Universe. Thirteenth edition, International edition. Australia: Brooks/Cole, Cengage Learning, 2014.
Citace podle MLA (9th ed.)Seeds, Michael A., a Dana E. Backman. Horizons: Exploring the Universe. Thirteenth edition, International edition. Brooks/Cole, Cengage Learning, 2014.
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