Gaya APA
World Book, Inc.. (2007).
The world book encyclopedia N-O volume 14 .
Chicago:
The World Book.
Gaya Chicago
World Book, Inc..
The world book encyclopedia N-O volume 14.
Chicago:
The World Book,
2007.
Text.
Gaya MLA
World Book, Inc..
The world book encyclopedia N-O volume 14.
Chicago:
The World Book,
2007.
Text.
Gaya Turabian
World Book, Inc..
The world book encyclopedia N-O volume 14.
Chicago:
The World Book,
2007.
Print.