reservoirs and dams in Northrhine-Westphalia (页面存档备份,存于互联网档案馆) (德文) Privatecollection of pictures from the early days of the dam, Sorpe valley prior and
Simon Collection. The Bottle of Anís del Mono, 1914, 索菲亚王后国家艺术中心博物馆 Fantômas, 1915, 國家藝廊 Still Life with Checked Tablecloth, 1915, Privatecollection. Newspaper