Gaya APA
The World Book Encyclopedia : U-V Volume 20. (2006).
chicago:
World book.
Gaya Chicago
The World Book Encyclopedia : U-V Volume 20.
Volume 20.
chicago:
World book,
2006.
Buku.
Gaya MLA
The World Book Encyclopedia : U-V Volume 20.
Volume 20.
chicago:
World book,
2006.
Buku.
Gaya Turabian
The World Book Encyclopedia : U-V Volume 20.
chicago:
World book,
2006.
Buku.