Herding, K., & Zaunschirm, T. (2004). Rudolf Knubel: Works on Paper ; 1971 - 2004 / Essays Klaus Herding & Thomas Zaunschirm. Klartext Verl..
Čikaški stil citiranja (17. izdanje)Herding, Klaus, i Thomas Zaunschirm. Rudolf Knubel: Works on Paper ; 1971 - 2004 / Essays Klaus Herding & Thomas Zaunschirm. Essen: Klartext Verl., 2004.
MLA način citiranja (8. izdanje)Herding, Klaus, i Thomas Zaunschirm. Rudolf Knubel: Works on Paper ; 1971 - 2004 / Essays Klaus Herding & Thomas Zaunschirm. Klartext Verl., 2004.
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