Syahrulyati, T. et al. 2018. Reserve Potential Sandy Clay as a Raw Materials Cement Village Hambalang, County Citeureup District BogorProvince Jawabarat – Indonesia. International Journal of Engineering and Technology. 7, 3.30 (Aug. 2018), 167–171. DOI:https://doi.org/10.14419/ijet.v7i3.30.19084.