Elita, E. (2018) “The Implementation Of Direct Learning Model By Using Props Beads At The Material Operations In Addition And Subtraction Of Integers At The Iva Class In Sd Negeri 002 Tualang”, Jurnal Ilmiah Pendidikan Scholastic, 2(1), pp. 140–149. doi: 10.36057/jips.v2i1.318.