Panita Sakulkaew และผู้แต่งคนอื่นๆ. (2007) An analysis of influential factors on management capability of secondary school directors. National Institute of Development Administration:ม.ป.ท.Panita Sakulkaew และผู้แต่งคนอื่นๆ. 2007. An analysis of influential factors on management capability of secondary school directors. ม.ป.ท.:National Institute of Development Administration;Panita Sakulkaew และผู้แต่งคนอื่นๆ. An analysis of influential factors on management capability of secondary school directors. ม.ป.ท.:National Institute of Development Administration, 2007. Print.