Drucker, P. F. (1967). The effective executive. New York: Harper and Row.
Trích dẫn kiểu ChicagoDrucker, Peter F. The Effective Executive. New York: Harper and Row, 1967.
MLA引文Drucker, Peter F. The Effective Executive. New York: Harper and Row, 1967.
警告：這些引文格式不一定是100％准確.