Bernard, M. et al. 2018. Constructing Student’s Mathematical Understanding Skills and Self Confidence: Math Game with Visual Basic Application for Microsoft Excel in Learning Phytagoras at Junior High School. International Journal of Engineering & Technology. 7, 3.2 (Jun. 2018), 732–736. DOI:https://doi.org/10.14419/ijet.v7i3.2.18738.