Goldmann, R., & Tepel, O. (2011). Nothing ist easy & selected works from the Hoesch Collection: Claus Richter. König.
Citazione stile Chigago Style (17a edizione)Goldmann, Renate, e Oliver Tepel. Nothing Ist Easy & Selected Works from the Hoesch Collection: Claus Richter. Köln: König, 2011.
Citatione MLA (8a ed.)Goldmann, Renate, e Oliver Tepel. Nothing Ist Easy & Selected Works from the Hoesch Collection: Claus Richter. König, 2011.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.