Tohutoro APA (7th ed.)
Drucker, P. F. (1982). The effective executive. Heinemann.
Tohutoru Kātū Chicago (17th ed.)
Drucker, Peter F. The Effective Executive. London: Heinemann, 1982.
Tohutoro MLA (9th ed.)
Drucker, Peter F. The Effective Executive. Heinemann, 1982.
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