Drucker, P. F. (2001). Management Challenges for the 21st Century. HarperCollins Publishers.
芝加哥风格引文Drucker, Peter F. Management Challenges for the 21st Century. New York: HarperCollins Publishers, 2001.
MLA引文Drucker, Peter F. Management Challenges for the 21st Century. HarperCollins Publishers, 2001.
警告:这些引文格式不一定是100%准确.