IBM. (2008). 2008 annual report. International Busines Machines Corporation.
Cita Chicago (17th ed.)IBM. 2008 Annual Report. Nueva York: International Busines Machines Corporation, 2008.
Cita MLA (9th ed.)IBM. 2008 Annual Report. International Busines Machines Corporation, 2008.
Atenció: Aquestes cites poden no estar 100% correctes.