Krisnamurti, C. N. “Efforts to Increase Motivation and Completeness in Learning Mathematics Through the Wordwall-Assisted Problem Based Learning Model”. Edumaspul: Jurnal Pendidikan, Vol. 8, no. 2, Oct. 2024, pp. 3708-15, https://ummaspul.e-journal.id/maspuljr/article/view/8495.