Gaya APA
Encyclopedia International - 19 Valhalla Zworykin. (1970).
New York:
Grolier Incorporated.
Gaya Chicago
Encyclopedia International - 19 Valhalla Zworykin.
.
New York:
Grolier Incorporated,
1970.
Text.
Gaya MLA
Encyclopedia International - 19 Valhalla Zworykin.
.
New York:
Grolier Incorporated,
1970.
Text.
Gaya Turabian
Encyclopedia International - 19 Valhalla Zworykin.
New York:
Grolier Incorporated,
1970.
Print.