Naumann, F. (1917). Was wird aus Polen? Georg Reimer.
Citazione stile Chigago Style (17a edizione)Naumann, Friedrich. Was Wird Aus Polen? Berlin: Georg Reimer, 1917.
Citatione MLA (9a ed.)Naumann, Friedrich. Was Wird Aus Polen? Georg Reimer, 1917.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.