APA Style
WORL BOOK , U-V Volume 20. (2007).
Chicago:
World Book, Inc.
Chicago Style
WORL BOOK , U-V Volume 20.
.
Chicago:
World Book, Inc,
2007.
Text.
MLA Style
WORL BOOK , U-V Volume 20.
.
Chicago:
World Book, Inc,
2007.
Text.
Turabian Style
WORL BOOK , U-V Volume 20.
Chicago:
World Book, Inc,
2007.
Print.