1. Didier, R. Rhin-Meuse, Art et Civilisation 800-1400, Cologne-Brussels (1972) 363-364 (standing virgin with child from Marches-les-Dames,c. 1270, Namur, Musée des Arts anciens du Namurois, cat. no. 99); 365 (virgin from a coronation,c. 1340-60, London, Vic-toria & Albert Museum, inv. no. 4-1929, and Apostles Peter and Paul, late 14th C., Miinster, Landesmuseum, inv. no. E. 81-82).
2. Erlande-Brandebourg, A. L'Art Gothique, Coll. Mazenod, Paris (1983) 395 (ill. no. 245, virgin and child, Cologne, Schnütgen Museum); 411 (ill. no. 322-323, apostles from the choir of Cologne cathedral, before 1322).