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Lua i Stíl Chicago (17ú heag.)BREYFOGLE III FORREST. IMPLEMENTING SIX SIGMA. 2ND. JOHN WILEY AND SONS: NEW JERSEY, 2003.
Lua MLA (9ú heag.)BREYFOGLE III FORREST. IMPLEMENTING SIX SIGMA. 2ND. NEW JERSEY, 2003.
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