Maysaroh, W., M. Mulyono, and A. W. Kurniasih. “The Mathematical Communication Ability Based on Student’s Self-Confidence in Problem Based Learning Models With Brainstorming Techniques”. Unnes Journal of Mathematics Education, Vol. 10, no. 3, Nov. 2021, pp. 166-73, doi:10.15294/ujme.v10i3.32286.