Drucker, P. F. (1995). Managing in a time of great change. Truman Talley Books/Dutton.
Lua i Stíl Chicago (17ú heag.)Drucker, Peter F. Managing in a Time of Great Change. New York: Truman Talley Books/Dutton, 1995.
Lua MLA (8ú heag.)Drucker, Peter F. Managing in a Time of Great Change. Truman Talley Books/Dutton, 1995.
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