Nasution, Torkis. “Sistem Verifikasi Tanda Tangan Digital Menggunakan Metoda Principal Component Analysis”. SATIN - Sains dan Teknologi Informasi 3, no. 1 (July 31, 2018): 40-50. Accessed February 23, 2025. http://389288.qwmy.asia/index.php/satin/article/view/352.