Nuttapong Yaengjun และ Sathiraporn Chaowachai. (2022) Strategic Management Approaches of Schools under the Secondary Education Service Area Office 39. <i>Humanities and Social Sciences Journal of Pibulsongkram Rajabhat University</i>, <i>16</i>(1), 381-390.Nuttapong Yaengjun และ Sathiraporn Chaowachai. "Strategic Management Approaches of Schools under the Secondary Education Service Area Office 39". Humanities and Social Sciences Journal of Pibulsongkram Rajabhat University 16 (2022):381-390.Nuttapong Yaengjun และ Sathiraporn Chaowachai. Strategic Management Approaches of Schools under the Secondary Education Service Area Office 39. Pibulsongkram Rajabhat University:ม.ป.ท. 2022.