THE WORLD BOOK ENCYCLOPEDIA. (1989). The world book encyclopedia: W-X-Y-Z. World Book.
Chicago Style (17. basım) AtıfTHE WORLD BOOK ENCYCLOPEDIA. The World Book Encyclopedia: W-X-Y-Z. Chicago: World Book, 1989.
MLA (9th ed.) AtıfTHE WORLD BOOK ENCYCLOPEDIA. The World Book Encyclopedia: W-X-Y-Z. World Book, 1989.
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