Kusnadi, Adhi. “Earned Value Management (EVM) Dalam Estimasi Biaya Proyek Piranti Lunak Menggunakan Spiral Development”. Ultima InfoSys : Jurnal Ilmu Sistem Informasi 6, no. 1 (June 30, 2015): 36-42. Accessed March 29, 2024. https://ejournals.umn.ac.id/index.php/SI/article/view/277.