Indah Purnamawati, Dwi, et al. “Identification of Source Rock Characteristics Based on Total Organic Carbon (TOC) Sojomerto Area and Vicinity Gemuh District, Kendal Regency Central Java Province”. Engineering And Technology Journal, vol. 9, no. 01, Jan. 2024, pp. 3392-5, doi:10.47191/etj/v9i01.20.