Muhammad Fahri , Tengku, and Johannes Tarigan. “Penggunaan Crum Rubber Pada Pembuatan Paving Blok”. Jurnal Syntax Admiration 2, no. 3 (March 23, 2021): 523-533. Accessed April 19, 2024. https://jurnalsyntaxadmiration.com/index.php/jurnal/article/view/192.