Samosir, M. B., V. Sihombing, and R. Pane. “IMPLEMENTATION OF USER CENTERED DESIGN METHOD ON WEB-BASED STOCK APP”. Jurnal Mantik, vol. 6, no. 1, May 2022, pp. 541-50, https://iocscience.org/ejournal/index.php/mantik/article/view/2315.