Gaya APA
The World Book Encyclopedia U,V Volume 20. (2007).
Chicago:
World Book Inc..
Gaya Chicago
The World Book Encyclopedia U,V Volume 20.
.
Chicago:
World Book Inc.,
2007.
Text.
Gaya MLA
The World Book Encyclopedia U,V Volume 20.
.
Chicago:
World Book Inc.,
2007.
Text.
Gaya Turabian
The World Book Encyclopedia U,V Volume 20.
Chicago:
World Book Inc.,
2007.
Print.