George Caryotakis: The Klystron: A Microwave Source of Surprising Range and Endurance (PDF) SLAC–PUB–7731 April 1998 - Rev. huhtikuu 1998. Stanford Linear Accelerator Center, Stanford University, Stanford CA 94309: Stanford University. Viitattu 27.3.2013. englanniksi
tubecollector.org
Jeremy M. Harmer: Virtual Valve MuseumJeremy M. Harmer Virtual Valve Museum. Arkistoitu 31.1.2013. Viitattu 28.5.2013. englanniksi