Wijayanti, K., A. Nikmah, and E. Pujiastuti. “Problem Solving Ability of Seventh Grade Students Viewed from Geometric Thinking Levels in Search Solve Create Share Learning Model”. Unnes Journal of Mathematics Education, Vol. 7, no. 1, Mar. 2018, pp. 8-16, doi:10.15294/ujme.v7i1.21251.