Gaya APA
Incorporated, G.
(1982).
The New Book of Knowledge - W-X-Y-Z, Volume 20
.
Canada:
Grolier Incorporated.
Gaya MLA
Incorporated, Grolier.
"The New Book of Knowledge - W-X-Y-Z, Volume 20".
Canada:
Grolier Incorporated,
1982.
Reference.