Drucker, P. F. (2011). Innovation & entrepreneurship. Butterworth.
Chicagoスタイル(17版)引用形式Drucker, Peter F. Innovation & Entrepreneurship. Oxford: Butterworth, 2011.
MLA(9版)引用形式Drucker, Peter F. Innovation & Entrepreneurship. Butterworth, 2011.
警告: この引用は必ずしも正確ではありません.