Bonami, F. (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.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Bonami, Francesco. 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]. Bielefel [u.a.]: Kerber, 2009.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Bonami, Francesco. 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, 2009.