COVEY STEPHEN R. (1995). PRINCIPLE CENTRED LEADERSHIP. SIMON & SCHUSTER INC.
Chicago-čujuhus (17. p.)COVEY STEPHEN R. PRINCIPLE CENTRED LEADERSHIP. LONDON: SIMON & SCHUSTER INC, 1995.
MLA-čujuhus (9. p.)COVEY STEPHEN R. PRINCIPLE CENTRED LEADERSHIP. SIMON & SCHUSTER INC, 1995.
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