Ginting H, Surya E. Development Learning Device Based for Measuring Contextual Critical Thinking Skills Students SD Class VI Mathematical. IJSBAR [Internet]. 2017 Jun. 8 [cited 2024 May 2];33(3):301-10. Available from: https://www.gssrr.org/index.php/JournalOfBasicAndApplied/article/view/7544