The 1989 arrl handbook for the radio amateur / The American Radio Relay League
Specialized communications techniques for the radio amateur / The American Radio Relay League
The radio amateur's VHF manual : principles and practice for the world above 50 Mhz
Communication equipments of Japan / Taizo Ishizaka; The Federation of Japan Electric Communication Industrial Associations
Radio-Sciencia : revista de vulgarisação radio-eléctrica / dir. Álvaro Contreiras