Hery Murtianto, Y., Nizaruddin, N. and Sutrisno, S.S. 2022. The Validity of a Multiple Representation of Calculus With Mathematica Learning Tool for Improving Students’ Productive Thinking Abilities. KnE Social Sciences. 7, 14 (Sep. 2022), 584–591. DOI:https://doi.org/10.18502/kss.v7i14.12012.