APA Style
WORL BOOK , W, X, Y, Z Volume 21. (2007).
Chicago:
World Book, Inc.
Chicago Style
WORL BOOK , W, X, Y, Z Volume 21.
.
Chicago:
World Book, Inc,
2007.
Text.
MLA Style
WORL BOOK , W, X, Y, Z Volume 21.
.
Chicago:
World Book, Inc,
2007.
Text.
Turabian Style
WORL BOOK , W, X, Y, Z Volume 21.
Chicago:
World Book, Inc,
2007.
Print.