Humble, J. W. (1973). How to manage by objectives. AMACOM.
Lua i Stíl Chicago (17ú heag.)Humble, John William. How to Manage by Objectives. [New York]: AMACOM, 1973.
Lua MLA (9ú heag.)Humble, John William. How to Manage by Objectives. AMACOM, 1973.
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