American Radio Relay League
The American Radio Relay League, Inc., 1962
Buku Referensi
edited by Keith Henney
McGraw-Hill, 1959
Buku Referensi
Venosa, Elettra, author
[, Springer Science+Business Media], 2012
eBooks
Carr, Joseph J., author
Newnes, 2002
Buku Referensi
Wei Zhang, editor
Springer Nature, 2019
eBooks