Wipanuch Ardrugsa และ Sunti Tirapat. (2007) Multiple directorships, firm performance and corporate governance of firms in Thailand. Chulalongkorn University:ม.ป.ท.Wipanuch Ardrugsa และ Sunti Tirapat. 2007. Multiple directorships, firm performance and corporate governance of firms in Thailand. ม.ป.ท.:Chulalongkorn University;Wipanuch Ardrugsa และ Sunti Tirapat. Multiple directorships, firm performance and corporate governance of firms in Thailand. ม.ป.ท.:Chulalongkorn University, 2007. Print.