Isti, N., Agoestanto, A. and Kurniasih, A. 2017. Analysis Critical Thinking Stage of Eighth Grade in PBL-Scaffolding Setting To Solve Mathematical Problems. Unnes Journal of Mathematics Education. 6, 1 (Mar. 2017), 52 - 62. DOI:https://doi.org/10.15294/ujme.v6i1.12593.