BEISER ARTHUR. (1983). EARTH (2ND.). TIME LIFE BOOKS.
Lua i Stíl Chicago (17ú heag.)BEISER ARTHUR. EARTH. 2ND. HONGKONG: TIME LIFE BOOKS, 1983.
Lua MLA (9ú heag.)BEISER ARTHUR. EARTH. 2ND. TIME LIFE BOOKS, 1983.
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