Gaya APA
The World Book Encyclopedia W,X,Y,Z Volume 21. (2007).
Chicago:
World Book Inc..
Gaya Chicago
The World Book Encyclopedia W,X,Y,Z Volume 21.
.
Chicago:
World Book Inc.,
2007.
Text.
Gaya MLA
The World Book Encyclopedia W,X,Y,Z Volume 21.
.
Chicago:
World Book Inc.,
2007.
Text.
Gaya Turabian
The World Book Encyclopedia W,X,Y,Z Volume 21.
Chicago:
World Book Inc.,
2007.
Print.