Bergstam, Thomas
- Provides photographs of test cards from television.
- http://acat.se/

Test Card Circle
- Learn about the history of British "Testcard" music played during television closedown periods.
- http://tcc.members.beeb.net/

BBC Test Card Club
- Rare photos of BBC Trade Test Transmissions and Identification Symbols from Keith Hamer's Collection. Includes pages on DX-TV.
- http://www.test-cards.fsnet.co.uk