· 564707 DRUCXER, Peter F Inova#ia sistemul antreprenorial practicä principii / Peter F....
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· 564707 DRUCXER, Peter F Inova#ia sistemul antreprenorial practicä principii / Peter F. Drucker. Bucuresti : Editura Enciclopedicä, 1993 . 25 cm. - (Biblioteca Bäncii Naeio-