Anwar, N., S. Budi Waluya, and S. Supriyadi. “Abilities of Mathematical Literacy Based on Self-Confidence in Problem Based Learning With DAPIC Problem-Solving Process”. Unnes Journal of Mathematics Education Research, Vol. 7, no. 1, Sept. 2018, pp. 152-60, https://journal.unnes.ac.id/sju/ujmer/article/view/25512.