Wutchana, Umporn, and Narumon Emarat. “Students’ Understanding of Graphical Vector Addition in One and Two Dimensions”. International Journal of Physics and Chemistry Education 3, no. 2 (August 25, 2011): 102–111. Accessed April 20, 2024. https://www.ijpce.org/index.php/IJPCE/article/view/195.