Orr, William I.
Howard W. Sams , 1987
Buku Referensi
Wilby, Pete
Routledge, 1994
Buku Referensi
Terman, Frederick Emmons
McGraw-Hill, 1955
Buku Teks
American Radio Relay League
American Radio Relay League, 1969
Buku Referensi
Biddulph, Dick. editor
Radio Society of Great Britain, 1994
Buku Referensi