Artist's estate stamp created by Christie's in 2003, forthcoming in Lugt; (Duke of Oldenburg, Schloss Oldenburg, Germany); (sale, Christie's New York, 22 January, 2003, part of no. 176); (Galerie Arnoldi-Livie, Munich); purchased by NGA, 2003.
- Arnoldi-Livie. Deutsche Zeichnungen Aquarelle und Ölskizzen, 1550 - 1914, Munich, 2003, no. 10.