Drucker Peter F. (2007). Management challenges for the 21st century. Elsevier.
芝加哥风格引文Drucker Peter F. Management Challenges for the 21st Century. Amsterdam: Elsevier, 2007.
MLA引文Drucker Peter F. Management Challenges for the 21st Century. Elsevier, 2007.
警告：这些引文格式不一定是100％准确.