1973. Letter from Demarco to Christian Boltanski. Ref. Seven French Artists exhibition. Ediburgh Arts 1973.
1975. Exhibition Catalogue. Page 38/45. Aspects '75 (contemporary Yugoslavian art). Gabrijel Stupica.
1973. Letter from Arnold Herstand to Richard Demarco. Ref. Twelve Hour Lecture blackboards by Joseph Beuys.