Oswald, A. (1909). Advanced course of German commercial correspondence. Blackie & son.
Citazione stile Chigago Style (17a edizione)Oswald, Alfred. Advanced Course of German Commercial Correspondence. London: Blackie & son, 1909.
Citatione MLA (8a ed.)Oswald, Alfred. Advanced Course of German Commercial Correspondence. Blackie & son, 1909.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.