Gaya APA
Incorporated, G. (1971).
Encyclopedia International 19: Valhalla-Zworykin .
Canada:
Grolier Incorporated.
Gaya MLA
Incorporated, Grolier.
"Encyclopedia International 19: Valhalla-Zworykin".
Canada:
Grolier Incorporated,
1971.
BUKU CETAK (PRINTED BOOK).