Freeman, J. Ernst Bloch and Hugo Ball: Toward an ontology of the avant-garde / Joel Freeman. Dada culture : critical texts on the Avant-garde.(2006).

Freeman, Joel. "Ernst Bloch and Hugo Ball: Toward an Ontology of the Avant-garde / Joel Freeman." Dada Culture : Critical Texts on the Avant-garde.(2006) .

Freeman, Joel. "Ernst Bloch and Hugo Ball: Toward an Ontology of the Avant-garde / Joel Freeman." Dada Culture : Critical Texts on the Avant-garde.(2006), .