Sumalong, O., Supriyatman, S. and Mansyur, J. . (2021) “The Problem Solving Ability in Vector Addition by Using Grid and Parallelogram”, Jurnal Riset Pendidikan MIPA. Palu, Sulawesi Tengah - INDONESIA, 5(2), pp. 75-80. doi: 10.22487/j25490192.2021.v5.i2.pp75-80.