Gaya APA
Inc, T, E, W, B.
(1992).
The World Book Encyclopedia (W-X-Y-Z Volume 21)
.
INGGRIS:
World Book Inc..
Gaya MLA
Inc, Tim, Editorial, World, Book.
"The World Book Encyclopedia (W-X-Y-Z Volume 21)".
INGGRIS:
World Book Inc.,
1992.
Text.