Pisak Wichakool และ Penjit Srinophakun. (2009) Hazop analysis database programming for petrochemical. Kasetsart University:ม.ป.ท.Pisak Wichakool และ Penjit Srinophakun. 2009. Hazop analysis database programming for petrochemical. ม.ป.ท.:Kasetsart University;Pisak Wichakool และ Penjit Srinophakun. Hazop analysis database programming for petrochemical. ม.ป.ท.:Kasetsart University, 2009. Print.