Putri, H, A Yulianto, G Nikawanti, P Rahayu, and N Majid. 2020. “Concrete Pictorial Abstract Approach to the Improvement of Elementary School Students’ Self Efficacy Mathematics”. International Conference on Mathematics and Science Education of Universitas Pendidikan Indonesia 4 (April), 25-31. http://science.conference.upi.edu/proceeding/index.php/ICMScE/article/view/212.