00391nam a2200145Ia 4500008004100000020001800041041000800059082001600067100002200083245006100105260002800166300001500194650002100209650001500230210719s1985    xx            000 0 und d  a0-434-90408-2  aeng  a658.42 DRUI  aDRUCKER (Peter F)  aInnovation and entrepreneurship: practice and principles  aLondonbHeinemannc1985  axi,258bPB  aEntrepreneurship  aManagement