Karun Puthanapibool และ Parames Chutima. (2008) Safety managment for maintenance of petrol station. Chulalongkorn University:ม.ป.ท.Karun Puthanapibool และ Parames Chutima. 2008. Safety managment for maintenance of petrol station. ม.ป.ท.:Chulalongkorn University;Karun Puthanapibool และ Parames Chutima. Safety managment for maintenance of petrol station. ม.ป.ท.:Chulalongkorn University, 2008. Print.