Anjaya, P. D., E. Susilaningsih, and A. Yulianto. “Development of Assessment Instruments for Learning Process of Mathematics in Drawing Geometry at the Elementary School Level of Karanganyar Regency”. Journal of Primary Education, Vol. 8, no. 3, Dec. 2018, pp. 309-14, https://journal.unnes.ac.id/sju/jpe/article/view/27709.