Adolph Menzel, 1815-1905 : Master Drawings from East Berlin (exhibition New York, The Frick Collection, 11.09 - 18.11.1990 ; Houston, Museum of Fine Arts, 01.12.1990 - 27.01-1991 ; Pittsburgh, Frick Art Museum, 16.02 - 07.04.1991 ; Cambridge, Busch-Reisinger Museum, 27.04 23.06.1991). - Betthausen, Peter (Art Services International,, 1990)