Nuril Azizah, R.W. 2025. Student’s mathematical concept understanding ability in the material of functions of class XI of SMA Islam Sabilurrosyad Gasek Malang. Pasundan Journal of Mathematics Education. 15, 1 (May 2025), 81–92. DOI:https://doi.org/10.23969/pjme.v15i1.20237.