ZEILIK, M. (1988). Astronomy The Evolving Universe Michael Zeilik. John Willey & Sons.
Lua i Stíl Chicago (17ú heag.)ZEILIK, Michael. Astronomy The Evolving Universe Michael Zeilik. John Willey & Sons, 1988.
Lua MLA (8ú heag.)ZEILIK, Michael. Astronomy The Evolving Universe Michael Zeilik. John Willey & Sons, 1988.
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