“DAS Ampal Analisa Fungsi dan Pengaruh Bangunan Pengendali Banjir DAS Ampal Kota Balikpapan”. SPECTA Journal of Technology 2, no. 3 (Agustus 23, 2018): 39. Diakses November 2, 2026. https://journal.itk.ac.id/index.php/sjt/article/view/10.