Goldmann, R., & Tepel, O. (2011). Nothing ist easy & selected works from the Hoesch Collection: Claus Richter. König.
Chicago Style (17. basım) AtıfGoldmann, Renate, ve Oliver Tepel. Nothing Ist Easy & Selected Works from the Hoesch Collection: Claus Richter. Köln: König, 2011.
MLA (8th ed.) AtıfGoldmann, Renate, ve Oliver Tepel. Nothing Ist Easy & Selected Works from the Hoesch Collection: Claus Richter. König, 2011.
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