PUTRI, Clarita; SUTOMO, Rudi. E Evaluation of Ultima InfoSys Site Usability Using Usability Test & System Usability Scale Method. Ultima InfoSys : Jurnal Ilmu Sistem Informasi, [S. l.], v. 13, n. 2, p. 85–93, 2023. DOI: 10.31937/si.v13i2.2812. Disponível em: https://ejournals.umn.ac.id/index.php/SI/article/view/2812. Acesso em: 8 oct. 2025.