Raguin, V. C. (2004). Medieval tropes for spiritual experience: Verification of St Francis' Seraphic vision through Erfurt's stained glass. Glas, Malerei, Forschung, pp. [77]-83.

Raguin, Virginia Chieffo. "Medieval Tropes for Spiritual Experience: Verification of St Francis' Seraphic Vision Through Erfurt's Stained Glass." Glas, Malerei, Forschung 2004: [77]-83.

Raguin, Virginia Chieffo. "Medieval Tropes for Spiritual Experience: Verification of St Francis' Seraphic Vision Through Erfurt's Stained Glass." Glas, Malerei, Forschung 2004: [77]-83.