Varothai Sunalai และ Waressara Weerawat. (2010) A simulation of vehicle fleet management system for network of NGV service stations. Mahidol University:ม.ป.ท.Varothai Sunalai และ Waressara Weerawat. 2010. A simulation of vehicle fleet management system for network of NGV service stations. ม.ป.ท.:Mahidol University;Varothai Sunalai และ Waressara Weerawat. A simulation of vehicle fleet management system for network of NGV service stations. ม.ป.ท.:Mahidol University, 2010. Print.