Drucker, P. (1985). Innovation and entrepreneurship. Heinemann.
Chicagoスタイル(17版)引用形式Drucker, Peter. Innovation and Entrepreneurship. London: Heinemann, 1985.
MLA(9版)引用形式Drucker, Peter. Innovation and Entrepreneurship. Heinemann, 1985.
警告: この引用は必ずしも正確ではありません.