Der geometrische Entwurf der Hagia Sophia in Istanbul : Bilder einer Ausstellung - Hoffmann, Volker (P. Lang, 2005)
" ... exhibition "The Geometrical Design of the Hagia Sophia in Istanbul" ... Hagia Sophia Museum (04/15-05/07/2005), ... 05/26-07/03/2005 ... at the Art Library, Staatliche Museen zu Berlin." -- Foreword.