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.
1977. In Varese Corridor (1976) by Dan Flavin. The Panza Collection, Varese, Italy. Edinburgh Arts 1977.