APA Style
The World Book Encyclopedia : U-V Volume 20. (2006).
Chicago:
World Book.
Chicago Style
The World Book Encyclopedia : U-V Volume 20.
Volume 20.
Chicago:
World Book,
2006.
BUKU.
MLA Style
The World Book Encyclopedia : U-V Volume 20.
Volume 20.
Chicago:
World Book,
2006.
BUKU.
Turabian Style
The World Book Encyclopedia : U-V Volume 20.
Chicago:
World Book,
2006.
BUKU.