Seeds, M. A. (2009). The solar system: Loose-leaf edition (Sixth edition.). Cengae Learning.
Lua i Stíl Chicago (17ú heag.)Seeds, Michael A. The Solar System: Loose-leaf Edition. Sixth edition. Australia: Cengae Learning, 2009.
Lua MLA (9ú heag.)Seeds, Michael A. The Solar System: Loose-leaf Edition. Sixth edition. Cengae Learning, 2009.
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