1970. Letter (page 7/7) from Robert Filliou to Georg Jappe. Ref. The Vocational Game. Strategy: Get Arts.
1970. Letter from Demarco to Beuys. Ref. Demarco's photographic documentation of Celtic (Kinloch Rannoch) Scottish Symphony. Strategy: Get Arts.
1972. David Helder directs performance event from summit of Arthur's Seat, Holyrood Park, Edinburgh. Edinburgh Arts 1972.