Tributes paid to Piccadilly Radio founder Philip Birch https://radiotoday.co.uk/2021/12/tributes-paid-to-piccadilly-radio-founder-philip-birch/
«Räuber und Polizei»: Die PTT und die Radiopiraterie https://blog.nationalmuseum.ch/2021/12/raeuber-und-polizei-die-ptt-und-die-radiopiraterie/