Drucker, P. F. (1999). Management challenges for the 21st century. Butterworth-Heinemann.
Chicagoスタイル(17版)引用形式Drucker, Peter F. Management Challenges for the 21st Century. Oxford: Butterworth-Heinemann, 1999.
MLA(8版)引用形式Drucker, Peter F. Management Challenges for the 21st Century. Butterworth-Heinemann, 1999.
警告: この引用は必ずしも正確ではありません.