วัชราไทย จ, ลำดวนหอม ช, เพียซ้าย ข. A STUDY OF CONCEPTUAL AND PROCEDURAL KNOWLEDGE DEFICIENCIES IN PERMUTATIONS OF MATHAYOMSUKSA V STUDENTS. J. IND. EDUC. [Internet]. 2018 Sep. 11 [cited 2024 Apr. 20];17(2):60-7. Available from: https://ph01.tci-thaijo.org/index.php/JIE/article/view/121726