Drucker, P. F. (1986). The Fontiers Of Management. Fruman Falley Books.
Lua i Stíl Chicago (17ú heag.)Drucker, Peter F. The Fontiers Of Management. Fruman Falley Books, 1986.
Lua MLA (8ú heag.)Drucker, Peter F. The Fontiers Of Management. Fruman Falley Books, 1986.
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