@article{art1231,
  title = {The Analysis of Critical Thinking Skill of Version P21 in Solving the Problems of Two Dimensional Arithmetic Derived from the Implementation of Guided Discovery Learning},
  doi = {10.18535/ijsrm/v6i1.m02},
  url = {https://ijsrm.net/index.php/ijecs/article/view/1231}
}