Drucker, P. (2006). Management challenges for the 21st Century. Palgrave Macmillan Punl.
芝加哥风格引文Drucker, Peter. Management Challenges for the 21st Century. New York: Palgrave Macmillan Punl, 2006.
MLA引文Drucker, Peter. Management Challenges for the 21st Century. Palgrave Macmillan Punl, 2006.
警告：这些引文格式不一定是100％准确.