Kasidet Pichayapat และ Sukruedee Sukchai. (2014) Fuel saving with HCNG in the internal combustion Engine. Naresuan University:ม.ป.ท.Kasidet Pichayapat และ Sukruedee Sukchai. 2014. Fuel saving with HCNG in the internal combustion Engine. ม.ป.ท.:Naresuan University;Kasidet Pichayapat และ Sukruedee Sukchai. Fuel saving with HCNG in the internal combustion Engine. ม.ป.ท.:Naresuan University, 2014. Print.