Il telegrafo senza fili : sistema marconi / Angelo Banti; Guglielmo Marconi
La télégraphie sans fil : Expliquée au public / Richard Popp; Jacques Duchange
Manual of wireless telegraphy (Radio) : for the use of naval electricians / Commander S. S. Robinson, U.S. Navy
A guide for the electric testing of telegraph cables / Captain V. Hoskiaer