Badziak, K. (1991). Great Capitalists Fortunes in the Polish Lands before 1939 (The Case of the Poznanski Family). Polin.
Lua i Stíl Chicago (17ú heag.)Badziak, Kazimierz. "Great Capitalists Fortunes in the Polish Lands Before 1939 (The Case of the Poznanski Family)." Polin 1991.
Lua MLA (8ú heag.)Badziak, Kazimierz. "Great Capitalists Fortunes in the Polish Lands Before 1939 (The Case of the Poznanski Family)." Polin, 1991.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.