Schalm, O., & Caluwé, D. (2009). Composition of 12-18th century window glass in Belgium: Non-figurative windows in secular buildings and stained-glass windows in religious buildings. Paris: Verre et Histoire.

Schalm, Olivier, and Danielle Caluwé. Composition of 12-18th Century Window Glass in Belgium: Non-figurative Windows in Secular Buildings and Stained-glass Windows in Religious Buildings. Paris: Verre et Histoire, 2009.

Schalm, Olivier, and Danielle Caluwé. Composition of 12-18th Century Window Glass in Belgium: Non-figurative Windows in Secular Buildings and Stained-glass Windows in Religious Buildings. Paris: Verre et Histoire, 2009.