MLA

Gaertner, Richard G Forbes, and Wolfram Knapp. Modern Developments In Vacuum Electron Sources. Springer International Publishing, 2020.

APA

Gaertner, G., Forbes, R. G, & Knapp, W. (2020). Modern Developments in Vacuum Electron Sources. Springer International Publishing.

Chicago

Gaertner, Richard G Forbes, and Wolfram Knapp. Modern Developments In Vacuum Electron Sources. : Springer International Publishing, 2020.