1. Primary sources
2. Archives
3. - Archives of the Land of Low Saxony in Wolfenbüttel. Niedersachsen Staatsarchiv Wolfenbüttel. NLA – Staatsarchiv Wolfenbüttel, 143N Zg. 2009/069 (50/1, 50/2, 161/2, 226, 237/1, 237/2, 254, 267, 445, 438, 377, 235, 236/1, 266, 332/2, 333).
4. - Archives of the West Institute (Instytut Zachodni) à Poznań. 60.1 to 60.8 ; Zbigniew Kulak’s Documents (1, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 29, 32, 40, 41, 42, 43, 44, 45, 47, 49, 52, 53, 78, 79, 81, 82, 83, 84).
5. - Archives of the Georg Eckert Institute in Brunswick. Documents of Georg Stöber, Siegfried Bachmann, Wolfgang Jacobmeyer, Elfriede Hillers. Correspondences. Many cartons not specifically identified.