สุขสำราญ สุภาศิณี. 2018. “STUDY OF RELATIONSHIP BETWEEN LEARNING ORGANIZATION AND 21st CENTURY SKILLS OF SCHOOLS UNDER THE SECONDARY EDUCATIONAL SERVICE AREA OFFICE 31”. Ph.D. In Social Sciences Journal 8 (2):116-31. https://so05.tci-thaijo.org/index.php/phdssj/article/view/89203.