Sumarno, S. 2021. PENGGUNAAN MODEL WATERFALL DALAM PENGEMBANGAN SISTEM MONITORING PRODUKTIFITAS KERJA PEGAWAI. DiJITAC : Digital Journal of Information Technology and Communication. 1, 2 (Apr. 2021), 48-60. DOI:https://doi.org/10.21093/dijitac.v1i2.4141.