Andrianingsih, Vivi, St. Budi Waluya, and Sugianto Sugianto. 2019. “Mathematical Communication Ability Assessed By Student Self- Efficacy In Learning The Two Stay Two Stray (TSTS) Model on Ability of Process Approach”. Unnes Journal of Mathematics Education Research 10 (A), 140-46. https://journal.unnes.ac.id/sju/ujmer/article/view/36180.