APA

Spangenberg К. R., . (1948). Vacuum Tubes. New York: McGRAW-HILL BOOK COMPANY, ШТС.

Chicago

Spangenberg К R, . 1948. Vacuum Tubes. New York: McGRAW-HILL BOOK COMPANY, ШТС.

Harvard

Spangenberg К. R., . (1948). Vacuum Tubes. New York: McGRAW-HILL BOOK COMPANY, ШТС.

MLA

Spangenberg К R, . Vacuum Tubes. New York: McGRAW-HILL BOOK COMPANY, ШТС. 1948.