TY - BOOK AU - Drucker, Peter Ferdinand TI - The effective executive ET - 1st Harper colophon ed PB - Harper & Row PY - 1985 T2 - Harper colophon books T2 - Harper & Row management library VL - CN 1209 EP - viii, 178 p. UR - https://ci.nii.ac.jp/ncid/BB0604117X SN - 006091209X ER -