Hellwig-Schmid, R. (2009). 2009 - Slovakia: International Festival for Art and Culture in Regensburg ; ars danubiana ; Perfect Asymmetry I/II ; Exhibition on the occasion of donumenta 2009 / Herausgeberin : Regina Hellwig-Schmid. donumenta Regensburg.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Hellwig-Schmid, Regina. 2009 - Slovakia: International Festival for Art and Culture in Regensburg ; Ars Danubiana ; Perfect Asymmetry I/II ; Exhibition on the Occasion of Donumenta 2009 / Herausgeberin : Regina Hellwig-Schmid. Regensburg: donumenta Regensburg, 2009.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Hellwig-Schmid, Regina. 2009 - Slovakia: International Festival for Art and Culture in Regensburg ; Ars Danubiana ; Perfect Asymmetry I/II ; Exhibition on the Occasion of Donumenta 2009 / Herausgeberin : Regina Hellwig-Schmid. donumenta Regensburg, 2009.