Vos, E. Critical perspectives on experimental, visual, and concrete poetry: An introduction to this volume (with an appendix on Carlfriedrich Claus) / Eric Vos. Experimental - visual - concrete : Avant-Garde Poetry since the 1960s.(1996).
Chicago-referens (17:e uppl.)Vos, Eric. "Critical Perspectives on Experimental, Visual, and Concrete Poetry: An Introduction to This Volume (with an Appendix on Carlfriedrich Claus) / Eric Vos." Experimental - Visual - Concrete : Avant-Garde Poetry Since the 1960s.(1996) .
MLA-referens (8:e uppl.)Vos, Eric. "Critical Perspectives on Experimental, Visual, and Concrete Poetry: An Introduction to This Volume (with an Appendix on Carlfriedrich Claus) / Eric Vos." Experimental - Visual - Concrete : Avant-Garde Poetry Since the 1960s.(1996), .