Sigma Insight Group. (2004). Corporate Strategy. Sigma Insight Group.
Chicagoスタイル(17版)引用形式Sigma Insight Group. Corporate Strategy. Seoul, korea: Sigma Insight Group, 2004.
MLA(8版)引用形式Sigma Insight Group. Corporate Strategy. Sigma Insight Group, 2004.
警告: この引用は必ずしも正確ではありません.