HODGE, P. W. Concepts of conteporery astronomy#Paul W Hodge. McGraw-.
Lua i Stíl Chicago (17ú heag.)HODGE, Paul W. Concepts of Conteporery Astronomy#Paul W Hodge. McGraw-.
Lua MLA (8ú heag.)HODGE, Paul W. Concepts of Conteporery Astronomy#Paul W Hodge. McGraw-.
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