Gumkowski, Janusz; Leszczynski, Kazimierz: Poland Under Nazi Occupation. Polonia Pub. House, 1961. "Archived copy". คลังข้อมูลเก่าเก็บจากแหล่งเดิมเมื่อ 2012-05-27. สืบค้นเมื่อ 2012-05-27.{{cite web}}: CS1 maint: archived copy as title (ลิงก์)
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