Gunawan Widjaja, Mochammad Roufal, Martin Maurer M.Marpaung, M Reydhi Suwanda. E – SIGNATURE DALAM E – KONTRAK. JCI [Internet]. 2022 Feb. 22 [cited 2025 Jul. 5];1(6):1369-82. Available from: https://mail.bajangjournal.com/index.php/JCI/article/view/1504