Otto Harder (Polish Wikipedia)

Analysis of information sources in references of the Wikipedia article "Otto Harder" in Polish language version.

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abendblatt.de

Roger Repplinger: Leg dich, Zigeuner. Die Geschichte von Johann Trollmann und Tull Harder. München: Piper, 2008. ISBN 3-492-04902-8. OCLC 221130658. (niem.).
Fritz Peters: Tull Harder stürmt für Deutschlands Fussballruhm. Hamburg: Falken, 1942. OCLC 72331632. (niem.).