Tanatip Poonsin และ Sunti Tirapat. (2008) Corporate governance and firm diversification : evidence from Thailand. Chulalongkorn University:ม.ป.ท.Tanatip Poonsin และ Sunti Tirapat. 2008. Corporate governance and firm diversification : evidence from Thailand. ม.ป.ท.:Chulalongkorn University;Tanatip Poonsin และ Sunti Tirapat. Corporate governance and firm diversification : evidence from Thailand. ม.ป.ท.:Chulalongkorn University, 2008. Print.