Jean Villette, The Enigma of the Labyrinth, Notre-Dame de Chartres, Chartres, n.d.
Penelope Doob, The Idea of the Labyrinth, from Classical Antiquity through the Middle Ages, Ithaca: Cornell UP, 1990


Related Material
S. Murray, Notre-Dame, Cathedral of Amiens : The Power of Change in Gothic, Cambridge, 1996, 171
R. Hamann-McClean et al, Die Kathedrale von Reims, Stuttgart, 1993, I, 1, 343-63