APA (7th ed.) Zitazioa

Spangenberg , K. R. (1948). Vacum tubes. Mc Graw -hill.

Chicago Style (17th ed.) Zitazioa

Spangenberg , Karl R. Vacum Tubes. New York: Mc Graw -hill, 1948.

MLA (9th ed.) Zitazioa

Spangenberg , Karl R. Vacum Tubes. Mc Graw -hill, 1948.