1970. Letter (page 7/7) from Robert Filliou to Georg Jappe. Ref. The Vocational Game. Strategy: Get Arts.
1975. Letter from RDG administrator Anne Goring to Scottish artist Fred Stiven, ref. Edinburgh Arts 1975 exhibition and publication.
1970. Letter (page 4/7) from Robert Filliou to Georg Jappe. Ref. The Vocational Game. Strategy: Get Arts.