Nugroho, Moh. “Increasing Motivation and Mathematics Learning Achievement in Sequences and Series Materials Using PBL Model With Triastra Method”. Unnes Journal of Mathematics Education 11, no. 1 (March 31, 2022): 12-20. Accessed December 21, 2024. https://journal.unnes.ac.id/sju/ujme/article/view/55837.