HELLER ROBERT. (1998). MOTIVATING PEOPLE. DORLING KINDERSLEY.
Chicago-čujuhus (17. p.)HELLER ROBERT. MOTIVATING PEOPLE. LONDON: DORLING KINDERSLEY, 1998.
MLA-čujuhus (9. p.)HELLER ROBERT. MOTIVATING PEOPLE. DORLING KINDERSLEY, 1998.
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