APA (7th ed.) Citation

Spangenberg, K. R. (1948). Vacuum tubes. McGraw-Hill.

Chicago Style (17th ed.) Citation

Spangenberg, Karl Rudolph. Vacuum Tubes. New York: McGraw-Hill, 1948.

MLA (9th ed.) Citation

Spangenberg, Karl Rudolph. Vacuum Tubes. McGraw-Hill, 1948.

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