Gaya APA
Book, W., Registrida, M.
(1997).
The World Book Encyclopedia Jilid 21 W.X.Y.Z
(
Cetakan 1)
.
USA:
World Book.
Gaya MLA
Book, World., Registrida, Marca.
"The World Book Encyclopedia Jilid 21 W.X.Y.Z".
Cetakan 1
USA:
World Book,
1997.
Text.