SIEGEL, D. (1999). FUTURE YOUR ENTERPRISE. JOHN WILEY.
Lua i Stíl Chicago (17ú heag.)SIEGEL, D. FUTURE YOUR ENTERPRISE. NEW YORK: JOHN WILEY, 1999.
Lua MLA (9ú heag.)SIEGEL, D. FUTURE YOUR ENTERPRISE. JOHN WILEY, 1999.
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