Oswald, A. (1909). Advanced course of German commercial correspondence. Blackie & son.
Čikaški stil citiranja (17. izdanje)Oswald, Alfred. Advanced Course of German Commercial Correspondence. London: Blackie & son, 1909.
MLA način citiranja (8. izdanje)Oswald, Alfred. Advanced Course of German Commercial Correspondence. Blackie & son, 1909.
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