Liong, Gouw Tjie. “Sonic Logging Vs PIT Untuk Mendeteksi Integritas Pondasi Tiang”. ComTech: Computer, Mathematics and Engineering Applications 2, no. 2 (December 1, 2011): 1031-1045. Accessed March 29, 2025. https://journal.binus.ac.id/index.php/comtech/article/view/2853.