TY - BOOK AU - Drucker,Peter F. TI - Management challenges for the 21st century SN - 0887309984 AV - HD 30.27 D794m 1999 PY - 1999/// CY - New York PB - HarperBusiness KW - Management KW - Forecasting KW - Twenty-first century KW - Forecasts KW - Gestion KW - Prévision ER -