Fix, J. D. (1995). Astronomy: Journey to the cosmic frontier. Mosby.
Lua i Stíl Chicago (17ú heag.)Fix, John D. Astronomy: Journey to the Cosmic Frontier. St. Louis: Mosby, 1995.
Lua MLA (8ú heag.)Fix, John D. Astronomy: Journey to the Cosmic Frontier. Mosby, 1995.
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