00305nam a2200121Ia 4500008004100000100002000041245004700061260003100108300000900139650001300148942000700161999001500168190216s9999||||xx |||||||||||||| ||und||  aPeter F Drucker 0aManagement Task Responsibilities Practises  bMannora Publicationsc1975  a839p  aCommerce  cBK  c4054d4054