Kanchana Chitsuporn. (1998) The study of leadership styles of school principals under Bangkok Metropolitan Administration. Mahidol University,:ม.ป.ท.Kanchana Chitsuporn. 1998. The study of leadership styles of school principals under Bangkok Metropolitan Administration. ม.ป.ท.:Mahidol University,;Kanchana Chitsuporn. The study of leadership styles of school principals under Bangkok Metropolitan Administration. ม.ป.ท.:Mahidol University, 1998. Print.