Text ( visual ) : unmediated The effective executive / Peter F. Drucker. -- 1st Harper colophon ed. -- : [pbk]. -- New York : Harper & Row , 1985. -- viii, 178 p. ; 21 cm. -- (Harper colophon books ; CN 1209 ; Harper & Row management library). -- Includes index. -- ISBN 006091209X ; (BB0604117X) ; https://ci.nii.ac.jp/ncid/BB0604117X Author Heading(s): Drucker, Peter Ferdinand. -- Classification(s): LCC : HD38.25.U6 ; DC19 : 658.4. -- Subject Heading(s): LCSH : Executives -- United States ; LCSH : Decision-making