Siegfried van Vriesland: May 2nd, 1886 - December 4th, 1939.
Čikaški stil citiranja (17. izdanje)Siegfried Van Vriesland: May 2nd, 1886 - December 4th, 1939.
MLA način citiranja (8. izdanje)Siegfried Van Vriesland: May 2nd, 1886 - December 4th, 1939.
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