Drucker. Management: Tasks, Responsibilities, Practices. Elsevier.
Chicagoスタイル(17版)引用形式Drucker. Management: Tasks, Responsibilities, Practices. Elsevier.
MLA(9版)引用形式Drucker. Management: Tasks, Responsibilities, Practices. Elsevier.
警告: この引用は必ずしも正確ではありません.