APA Style
The World Book Encyclopedia A.1. (2007).
USA:
World Book.
Chicago Style
The World Book Encyclopedia A.1.
.
USA:
World Book,
2007.
Text.
MLA Style
The World Book Encyclopedia A.1.
.
USA:
World Book,
2007.
Text.
Turabian Style
The World Book Encyclopedia A.1.
USA:
World Book,
2007.
Print.