Clüver, C. Concrete poetry: Critical perspectives from the 90s / Claus Clüver. Experimental - visual - concrete : Avant-Garde Poetry since the 1960s.(1996).

Clüver, Claus. "Concrete Poetry: Critical Perspectives from the 90s / Claus Clüver." Experimental - Visual - Concrete : Avant-Garde Poetry Since the 1960s.(1996) .

Clüver, Claus. "Concrete Poetry: Critical Perspectives from the 90s / Claus Clüver." Experimental - Visual - Concrete : Avant-Garde Poetry Since the 1960s.(1996), .