Παραπομπή APA

Eastman, A. V. (1949). Fundamentals of vacuum tubes (3.).

Παραπομπή Chicago Style

Eastman, Austin V. Fundamentals of Vacuum Tubes. 3. McGraw-Hill Book Company, New York, 1949.

Παραπομπή MLA

Eastman, Austin V. Fundamentals of Vacuum Tubes. 3. 1949.