Risdiyanti, I., and R. C. I. Prahmana. “The Learning Trajectory of Number Pattern Learning Using Barathayudha War Stories and Uno Stacko”. Journal on Mathematics Education, vol. 11, no. 1, Jan. 2020, pp. 157-66, https://jme.ejournal.unsri.ac.id/index.php/jme/article/view/3815.