"Gottlieb, Maurycy" [Gottlieb, Maurice]. Malarstwo, Europa (in Polish). Encyklopedia WIEM. Archived from the original on 17 January 2006. Retrieved 23 November 2012.
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"Gottlieb, Maurycy" [Gottlieb, Maurice]. Malarstwo, Europa (in Polish). Encyklopedia WIEM. Archived from the original on 17 January 2006. Retrieved 23 November 2012.