Jocks, H. (1991). Norbert Tadeusz: Kunstmuseum Düsseldorf, 26.5.-14.7.1991 : Galerie Wolfgang Gmyrek, Düsseldorf, 13.9.-26.10.1991 : Ruth Siegel Gallery, New York, 2.10.-2.11.1991 / Heinz-Norbert Jocks. Kunstforum.
Citazione stile Chigago Style (17a edizione)Jocks, Heinz-Norbert. "Norbert Tadeusz: Kunstmuseum Düsseldorf, 26.5.-14.7.1991 : Galerie Wolfgang Gmyrek, Düsseldorf, 13.9.-26.10.1991 : Ruth Siegel Gallery, New York, 2.10.-2.11.1991 / Heinz-Norbert Jocks." Kunstforum 1991.
Citatione MLA (8a ed.)Jocks, Heinz-Norbert. "Norbert Tadeusz: Kunstmuseum Düsseldorf, 26.5.-14.7.1991 : Galerie Wolfgang Gmyrek, Düsseldorf, 13.9.-26.10.1991 : Ruth Siegel Gallery, New York, 2.10.-2.11.1991 / Heinz-Norbert Jocks." Kunstforum, 1991.
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