APA Citation

Humphrey, E. (1975). Encyclopedia International: V.19.: Valhalla - Zworykin. Grolier Inc.

Chicago Style Citation

Humphrey, Edward. Encyclopedia International: V.19.: Valhalla - Zworykin. Grolier Inc, 1975.

MLA Citation

Humphrey, Edward. Encyclopedia International: V.19.: Valhalla - Zworykin. Grolier Inc, 1975.

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