Sinsappaiboon P, Topithak K. The Development of a Modified Essay Question Test of Physics Problem Solving Ability by Heller and Heller’s Logical Problem on Static Electricity for Grade 11th Students. OJED [Internet]. 2020 Sep. 15 [cited 2024 May 1];15(2):OJED1502010 (12 pages). Available from: https://so01.tci-thaijo.org/index.php/OJED/article/view/241272