Munarsyah, Tryas and , Kusmiyati, S.T., M.T., Ph.D. and , Eni Budiyati, S.T., M.Eng (2017) Plant Design of Gypsum Using Limestone and Sulfuric Acid with Capacity 150,000 Tons/Year. Skripsi thesis, Universitas Muhammadiyah Surakarta.