Özge Erdem, Gülfem Sarpkaya Aktaş. “Assessment of Activity-Based Instruction in Overcoming 7th Grade Middle School Students’ Misconceptions in Algebra”. Turkish Journal of Computer and Mathematics Education (TURCOMAT), vol. 9, no. 2, Aug. 2018, pp. 312-38, https://turcomat.org/index.php/turkbilmat/article/view/179.