BEISER ARTHUR. (1983). EARTH (2ND.). TIME LIFE BOOKS.
Cita Chicago (17th ed.)BEISER ARTHUR. EARTH. 2ND. HONGKONG: TIME LIFE BOOKS, 1983.
Cita MLA (9th ed.)BEISER ARTHUR. EARTH. 2ND. TIME LIFE BOOKS, 1983.
Atenció: Aquestes cites poden no estar 100% correctes.