ARMSTRONG MICHAEL. (1993). HANDBOOK OF MANAGEMENT TECHNIQUE (2.). KOGAN PAGE.
Lua i Stíl Chicago (17ú heag.)ARMSTRONG MICHAEL. HANDBOOK OF MANAGEMENT TECHNIQUE. 2. NEW JERSEY: KOGAN PAGE, 1993.
Lua MLA (9ú heag.)ARMSTRONG MICHAEL. HANDBOOK OF MANAGEMENT TECHNIQUE. 2. KOGAN PAGE, 1993.
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