Drucker, P. F. Preparing Tomorrow Business Leader Today Peter F. Drucker. Prentice-Hall.
Lua i Stíl Chicago (17ú heag.)Drucker, Peter F. Preparing Tomorrow Business Leader Today Peter F. Drucker. Prentice-Hall.
Lua MLA (8ú heag.)Drucker, Peter F. Preparing Tomorrow Business Leader Today Peter F. Drucker. Prentice-Hall.
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