Chamberlain, Houston Stewart (), Die Grundlagen des Neunzehnten Jahrhunderts (în German), Munich, Germany: F. Bruckmann, OCLC27828004Mentenanță CS1: Limbă nerecunoscută (link) Electronic copy is available from the Hathi Trust Digital Library (volume 1) and (volume 2).
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Chamberlain, Houston Stewart (), Die Grundlagen des Neunzehnten Jahrhunderts (în German), Munich, Germany: F. Bruckmann, OCLC27828004Mentenanță CS1: Limbă nerecunoscută (link) Electronic copy is available from the Hathi Trust Digital Library (volume 1) and (volume 2).