Yen, Chong Chin, and Nor'ain Mohd Tajudin. “Assessing First Year Pre-Service Teachers’ Geometric Reasoning Ability on Two-Dimensional Shapes (1 - 12)”. EDUCATUM Journal of Science, Mathematics and Technology, vol. 2, no. 1, June 2015, pp. 1-12, https://ejournal.upsi.edu.my/index.php/EJSMT/article/view/24.