Rumbiak, Melanesia N.W., and Johan Setiawan. “Evaluasi Usability Website library.umn.ac.Id Universitas Multimedia Nusantara”. Ultima InfoSys : Jurnal Ilmu Sistem Informasi, vol. 8, no. 2, Dec. 2017, pp. 87-94, doi:10.31937/si.v8i2.618.