Asih, K., I. Isnarto, and S. Sukestiyarno. “Mathematical Communication Skills Reviewed From Mathematical Resilience in Independent Learning and Discovery Learning Assisted by E - Learning”. Unnes Journal of Mathematics Education Research, Vol. 10, no. A, Nov. 2019, pp. 112-20, https://journal.unnes.ac.id/sju/ujmer/article/view/35210.