Analysis of information sources in references of the Wikipedia article "Carl Sternheim" in English language version.
{{cite web}}: CS1 maint: archived copy as title (link){{cite book}}: |website= ignored (help){{cite web}}: CS1 maint: archived copy as title (link) Steve Martin's The Underpants, production study guide for an adaptation of Sternheim's play at the Capital Repertory Theatre (3 November – 2 December 2006), "About the Original Playwright", p. 8.Vincent van Gogh's early popularity in Germany is mirrored in the substantial number of private collectors who were already purchasing his works around the turn of the century. Among the key figures in this context were Thea and Carl Sternheim, the sugar manufacturer Adolf Rothermundt, the banker Paul von Mendelssohn-Bartholdy, the art patron and diplomat Harry Graf Kessler and the artist couple Maria Slavona and Willy Gretor. Many dealers, such as Alfred Flechtheim and Paul Cassirer, likewise bought works by Van Gogh.
{{cite web}}: CS1 maint: archived copy as title (link){{cite web}}: CS1 maint: archived copy as title (link) Steve Martin's The Underpants, production study guide for an adaptation of Sternheim's play at the Capital Repertory Theatre (3 November – 2 December 2006), "About the Original Playwright", p. 8.