Delima, Nita, and Dian Cahyawati. “Students’ Mathematics Self-Concept, Mathematics Anxiety and Mathematics Self-Regulated Learning During the Covid-19 Pandemic ”. Jurnal Pendidikan Matematika, vol. 15, no. 2, June 2021, pp. 103-14, https://jpm.ejournal.unsri.ac.id/index.php/jpm/article/view/230.