Ismar Littmann Art Collection (English Wikipedia)

Barnstone, Deborah Ascher (2006). "Weimar Era Breslau and Ismar Littmann's Modern Art Collection". The Art Book. 13 (4): 28–30. doi:10.1111/j.1467-8357.2006.00723.x. ISSN 1368-6267. One striking fact about Breslau is thedisproportionate number of important modern art collectors who were Jews.Among those with the most distinguishedpieces were Max Friedmann, Leo Levin,Ismar Littmann, Carl Sachs, Julius Shott-la¨nder, Max Silberberg, and Leo Smosh-ever

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Huttenlauch, A.B. (2008). "Ausstellung "Raub und Restitution. Kulturgut aus jüdischem Besitz von 1933 bis heute" im Jüdischen Museum, Berlin, 19. September 2008 bis 25. Januar 2009". KUR - Kunst und Recht. 10 (6): 168. doi:10.15542/kur/2008/6/8. ISSN 1437-2355.
Barnstone, Deborah Ascher (2006). "Weimar Era Breslau and Ismar Littmann's Modern Art Collection". The Art Book. 13 (4): 28–30. doi:10.1111/j.1467-8357.2006.00723.x. ISSN 1368-6267. One striking fact about Breslau is thedisproportionate number of important modern art collectors who were Jews.Among those with the most distinguishedpieces were Max Friedmann, Leo Levin,Ismar Littmann, Carl Sachs, Julius Shott-la¨nder, Max Silberberg, and Leo Smosh-ever
Barnstone, Deborah Ascher (2016). "Dissemination of Taste". Dissemination of Taste:: Breslau Collectors, Arts Associations, and Museums. Cultural Modernity in Breslau, 1918-33. University of Michigan Press. pp. 108–132. doi:10.2307/j.ctt1gk088m.8. ISBN 978-0-472-11990-5. JSTOR j.ctt1gk088m.8. Retrieved 2021-03-18. {{cite book}}: |work= ignored (help)

Barnstone, Deborah Ascher (2016). "Dissemination of Taste". Dissemination of Taste:: Breslau Collectors, Arts Associations, and Museums. Cultural Modernity in Breslau, 1918-33. University of Michigan Press. pp. 108–132. doi:10.2307/j.ctt1gk088m.8. ISBN 978-0-472-11990-5. JSTOR j.ctt1gk088m.8. Retrieved 2021-03-18. {{cite book}}: |work= ignored (help)

"Ketterer Kunst, Art auctions, Book auctions Munich, Hamburg & Berlin". www.kettererkunst.com. Retrieved 2022-09-30. In 1930 the work was part of the famous collection of the well-known Jewish lawyer and patron Dr. Ismar Littmann. Littmann was a luminary of the Wroclaw art scene and his collection was one of the most significant ones of the 20th century. After the National Socialists had seized power he was no longer able to practice his profession and got into tremendous financial straits. He commited [sic] suicide in 1934. As the National Socialist regime persecuted his widow and the four children, they were forced to sell the art collection

"HCPO Gallery: Dr. Ismar Littmann - biography". Department of Financial Services. Retrieved 2022-02-06. Dr. Littmann's persecution began almost immediately after the NSDAP's rise to power in 1933, as Jewish professionals practicing law in Breslau were among the first groups targeted by the Nazi regime. At the end of March 1933 the number of Jewish lawyers, notaries, and judges able to carry out their trade was severely curtailed. Far reaching restrictions imposed on Jewish legal practitioners had a direct and immediate effect on the Littmann family.
"HCPO Gallery: The Ismar Littman Collection". www.dfs.ny.gov. Archived from the original on 2016-01-02.

Huttenlauch, A.B. (2008). "Ausstellung "Raub und Restitution. Kulturgut aus jüdischem Besitz von 1933 bis heute" im Jüdischen Museum, Berlin, 19. September 2008 bis 25. Januar 2009". KUR - Kunst und Recht. 10 (6): 168. doi:10.15542/kur/2008/6/8. ISSN 1437-2355.
Heuß, Anja. "Die Sammlung Littmann und die Aktion "Entartete Kunst"". Raub und Restitution / hrsg. von Inka Bertz und Michael Dorrmann. 68-7. OCLC 887311989. {{cite journal}}: Cite journal requires |journal= (help)
Barnstone, Deborah Ascher (2006). "Weimar Era Breslau and Ismar Littmann's Modern Art Collection". The Art Book. 13 (4): 28–30. doi:10.1111/j.1467-8357.2006.00723.x. ISSN 1368-6267. One striking fact about Breslau is thedisproportionate number of important modern art collectors who were Jews.Among those with the most distinguishedpieces were Max Friedmann, Leo Levin,Ismar Littmann, Carl Sachs, Julius Shott-la¨nder, Max Silberberg, and Leo Smosh-ever
Herausgeber, Fleckner, Uwe 1961- Herausgeber Gaehtgens, Thomas W. Herausgeber Huemer, Christian (2017). Markt und Macht der Kunsthandel im »Dritten Reich«. De Gruyter. ISBN 978-3-11-054719-1. OCLC 1006782142.{{cite book}}: CS1 maint: multiple names: authors list (link) CS1 maint: numeric names: authors list (link)

Heuß, Anja. "Die Sammlung Littmann und die Aktion "Entartete Kunst"". Raub und Restitution / hrsg. von Inka Bertz und Michael Dorrmann. 68-7. OCLC 887311989. {{cite journal}}: Cite journal requires |journal= (help)
Herausgeber, Fleckner, Uwe 1961- Herausgeber Gaehtgens, Thomas W. Herausgeber Huemer, Christian (2017). Markt und Macht der Kunsthandel im »Dritten Reich«. De Gruyter. ISBN 978-3-11-054719-1. OCLC 1006782142.{{cite book}}: CS1 maint: multiple names: authors list (link) CS1 maint: numeric names: authors list (link)