NALURITA, B., W. WALID, and A. Cahyono. “Problem Solving Skill Seen from Adversity Quotient through Problem Based Learning Assisted by E-Comic Math”. Unnes Journal of Mathematics Education Research, Vol. 10, no. A, Dec. 2019, pp. 147-54, https://journal.unnes.ac.id/sju/ujmer/article/view/36308.