RNI – 1970 01 23 – first test transmission (22 mins) https://www.mixcloud.com/Marinebroadcasters/rni-1970-01-23-first-test-transmission-22-mins/
Radio Centraal Den Haag – 5 Jaar Historie https://www.mixcloud.com/martin-ja-van-dauven/radio-centraal-den-haag-5-jaar-historie/