FREYENS, Robert & NIZET, Jean-Marie. Photos d’antan. Verviers et alentours. Maurice Closset, photographe amateur. Verviers, Temps Jadis, 1993.
<b>1905 * Verviers</b> ° 11.5.1883. A collection of 170 glass-plate negatives, preserved by his family, depict pre-World War I Verviers and its region.