Gunawan Widjaja, Mochammad Roufal, Martin Maurer M.Marpaung, and M Reydhi Suwanda. “E – SIGNATURE DALAM E – KONTRAK”. Jurnal Cakrawala Ilmiah 1, no. 6 (February 22, 2022): 1369–1382. Accessed July 5, 2025. https://mail.bajangjournal.com/index.php/JCI/article/view/1504.