APA (7th ed.) Citation
(1994). The world book encyclopedia: Vol.9 (ed.). World book, Inc..
Chicago Style (17th ed.) Citation
The World Book Encyclopedia: Vol.9. ed. Chicago: World book, Inc., 1994.
MLA (9th ed.) Citation
The World Book Encyclopedia: Vol.9. ed. World book, Inc., 1994.
Warning: These citations may not always be 100% accurate.