Edi, Harisman, Baba Barus, and Dwi Putro Tejo Baskoro. 2019. “Mapping of Peatland Subsidence in Peat Hydrology Unit Jangkang River – Liong River in Bengkalis Island: Pemetaan Subsiden Di Kesatuan Hidrologi Gambut Sungai Jangkang – Sungai Liong Pulau Bengkalis”. Jurnal Ilmu Tanah Dan Lingkungan 19 (1), 13-18. https://doi.org/10.29244/jitl.19.1.13-18.