Leterman, E. G. (1974). Sales and sales management (1a. ed.). Alexander Hamilton Institute.
Chicago-čujuhus (17. p.)Leterman, Elmer G. Sales and Sales Management. 1a. ed. Nueva York: Alexander Hamilton Institute, 1974.
MLA-čujuhus (9. p.)Leterman, Elmer G. Sales and Sales Management. 1a. ed. Alexander Hamilton Institute, 1974.
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