Ahrens, C. (2007). Paint it blue: ACT art collection Siegfried Loch.
Čikaški stil citiranja (17. izdanje)Ahrens, Carsten. Paint It Blue: ACT Art Collection Siegfried Loch. Bremen, 2007.
MLA način citiranja (8. izdanje)Ahrens, Carsten. Paint It Blue: ACT Art Collection Siegfried Loch. 2007.
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