Darmawan, Wawan, Sunardi Sunardi, and Anton Yudhana. 2020. “Analysis of Mobile Based Activity Reporting Systems Using Usability Testing Methods and Use Questioners: Analysis of Mobile Based Activity Reporting Systems Using Usability Testing Methods and Use Questioners”. Jurnal Mantik 4 (1):69-73. https://www.ejournal.iocscience.org/index.php/mantik/article/view/679.