APA Citation

(1970). Encyclopedia international: Valhalla-Zworykin (Volume 19.). Canada: Grolier.

Chicago Style Citation

Encyclopedia International: Valhalla-Zworykin. Volume 19. Canada: Grolier, 1970.

MLA Citation

Encyclopedia International: Valhalla-Zworykin. Volume 19. Canada: Grolier, 1970.

Warning: These citations may not always be 100% accurate.