Elfenbein, J. (1972). Business letters and communications (1a. ed.). Alexander Hamilton Institute.
Chicago-čujuhus (17. p.)Elfenbein, Julien. Business Letters and Communications. 1a. ed. Nueva York: Alexander Hamilton Institute, 1972.
MLA-čujuhus (9. p.)Elfenbein, Julien. Business Letters and Communications. 1a. ed. Alexander Hamilton Institute, 1972.
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