APA (7th ed.) Citation

Fleming, A. The thermionic valve and its developments in radio telegraphy and telphony / by J.A. Fleming. Wireless World.

Chicago Style (17th ed.) Citation

Fleming, Ambrose. The Thermionic Valve and Its Developments in Radio Telegraphy and Telphony / by J.A. Fleming. Wireless World.

MLA (9th ed.) Citation

Fleming, Ambrose. The Thermionic Valve and Its Developments in Radio Telegraphy and Telphony / by J.A. Fleming. Wireless World.

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