Jariengporn Wongraksa และ Wanida Phankaeo. (2008) The study of leadership styles of managers in a chemical company in Bangkok, Thailand. Thammasat University:ม.ป.ท.Jariengporn Wongraksa และ Wanida Phankaeo. 2008. The study of leadership styles of managers in a chemical company in Bangkok, Thailand. ม.ป.ท.:Thammasat University;Jariengporn Wongraksa และ Wanida Phankaeo. The study of leadership styles of managers in a chemical company in Bangkok, Thailand. ม.ป.ท.:Thammasat University, 2008. Print.