Gumkowski, Janusz; Leszczynski, Kazimierz; Robert, Edward (translator) (1961). Hitler's Plans for Eastern Europe. Poland Under Nazi Occupation (edisi ke-First). Polonia Pub. House. hlm. 219. ASINB0006BXJZ6. Archived from the original on 2011-04-09. Diakses tanggal March 12, 2014.Pemeliharaan CS1: Url tak layak (link) at Wayback machine.
Gumkowski, Janusz; Leszczynski, Kazimierz; Robert, Edward (translator) (1961). Hitler's Plans for Eastern Europe. Poland Under Nazi Occupation (edisi ke-First). Polonia Pub. House. hlm. 219. ASINB0006BXJZ6. Archived from the original on 2011-04-09. Diakses tanggal March 12, 2014.Pemeliharaan CS1: Url tak layak (link) at Wayback machine.