Diah Purnamawanti, Dian Arumningsih. “SPESIALISASI TEKNIK SIPIL”. Jurnal Teknik Sipil dan Arsitektur 9, no. 13 (February 13, 2011). Accessed April 30, 2024. http://ejournal.utp.ac.id/index.php/JTSA/article/view/48.