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References
- ↑ "Radio Industry: closed circuit radio station, school radio station, college dormitories". Archived from the original on 2012-09-27. Retrieved 2011-04-16.
- ↑ The early days of armed forces radio Archived 2011-07-21 at the Wayback Machine
- ↑ Closed-circuit communications signal distribution system
- ↑ Radio behind bars – The Polish case
- ↑ Closed-circuit Radio Relays Game
- ↑ College Closed-circuit Radio Station Gets New, More Powerful Transmitter
- ↑ Closed-circuit Radio Network in Homes Seen
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