DRUCKER PETER F. (2001). ESSENTIAL DRUCKER: PRE-EMINENT MANAGEMENT..OUR TIME (NA.). Butterworth,Heinemann.
Lua i Stíl Chicago (17ú heag.)DRUCKER PETER F. ESSENTIAL DRUCKER: PRE-EMINENT MANAGEMENT..OUR TIME. NA. Great,Britain: Butterworth,Heinemann, 2001.
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Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.