Hartono, Juandra, et al. “Evaluasi Keutuhan Borepile Metode Crosshole Sonic Logging (CSL) Pembangunan Jembatan Pulau Balang II”. Jurnal Aplikasi Teknik Sipil, vol. 19, no. 4, July 2025, pp. 461-8, https://journal.its.ac.id/index.php/jats/article/view/7359.