Kessler, M. Between History and Futurology: Ossip K. Flechtheim / Mario Kessler. German scholars in exile : new studies in intellectual history.
Chicago-Zitierstil (17. Ausg.)Kessler, Mario. "Between History and Futurology: Ossip K. Flechtheim / Mario Kessler." German Scholars in Exile : New Studies in Intellectual History .
MLA-Zitierstil (8. Ausg.)Kessler, Mario. "Between History and Futurology: Ossip K. Flechtheim / Mario Kessler." German Scholars in Exile : New Studies in Intellectual History, .
警告：这些引文格式不一定是100％准确.