APA Style
the world book encyclipedia. (2006).
Chicago:
World Book.
Chicago Style
the world book encyclipedia.
Vol.20.
Chicago:
World Book,
2006.
Text.
MLA Style
the world book encyclipedia.
Vol.20.
Chicago:
World Book,
2006.
Text.
Turabian Style
the world book encyclipedia.
Chicago:
World Book,
2006.
Print.