Sigma Insight Group. (2004). Corporate Strategy. Sigma Insight Group.
Cita Chicago (17th ed.)Sigma Insight Group. Corporate Strategy. Seoul, korea: Sigma Insight Group, 2004.
Cita MLA (8th ed.)Sigma Insight Group. Corporate Strategy. Sigma Insight Group, 2004.
Atenció: Aquestes cites poden no estar 100% correctes.