1975. Exhibition Catalogue. Page 17/45. Aspects '75 (contemporary Yugoslavian art). Nikola Gvozdenovic.
1970. Letter (page 2/2) from Demarco to Willi Fleischer, Cultural Officer of the City of Dusseldorf. Ref. Strategy: Get Arts.
1976. Letter (page 2/2) from Michael Shepherd, art critic, Sunday Telegraph, to the Scottish Arts Council, ref. Edinburgh Arts.