Marzuki, Corry Corazon, Era Napra Tilopa Sihombing, Abdussakir Abdussakir, and Ade Novia Rahma. “Nilai Ketakteraturan Total Dari Lima Copy Graf Bintang”. Jurnal Fourier 9, no. 2 (October 31, 2020): 75–83. Accessed September 26, 2022. https://fourier.or.id/index.php/FOURIER/article/view/116.