(2009). Helmut Middendorf: Over the under the over ; 1997 - 2009 ; [... on the occasion of the exhibition ...] / Benaki Museum, Athens. [In collaboration with the Macedonian Museum of Contemporary Art in Thessaloniki]. Kerber Verlag.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Helmut Middendorf: Over the Under the over ; 1997 - 2009 ; [... on the Occasion of the Exhibition ...] / Benaki Museum, Athens. [In Collaboration with the Macedonian Museum of Contemporary Art in Thessaloniki]. Bielefeld ; Leipzig: Kerber Verlag, 2009.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Helmut Middendorf: Over the Under the over ; 1997 - 2009 ; [... on the Occasion of the Exhibition ...] / Benaki Museum, Athens. [In Collaboration with the Macedonian Museum of Contemporary Art in Thessaloniki]. Kerber Verlag, 2009.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.