(en-GB) Philip Oltermann, «Death, power and paranoia: painting that shocked German society finally returns to Berlin», The Guardian, (ISSN0261-3077, lire en ligne, consulté le )
(en-GB) Philip Oltermann, «Death, power and paranoia: painting that shocked German society finally returns to Berlin», The Guardian, (ISSN0261-3077, lire en ligne, consulté le )