(1)
Vebianti, F. M.; Sunardi; Suwito, A.; Trapsilasiwi, D.; Oktavianingtyas, E. Analysis of Geometry Problem Solving Based on APOS Theory for Class IX Students. JELMaR 2022, 3 (1), 33-41. https://doi.org/10.37303/jelmar.v3i1.108.