Chollaya Chotivetthamrong และ Jittra Rukijkanpanich. (2006) Production time loss reduction in an ice-cream factory. Chulalongkorn University:ม.ป.ท.Chollaya Chotivetthamrong และ Jittra Rukijkanpanich. 2006. Production time loss reduction in an ice-cream factory. ม.ป.ท.:Chulalongkorn University;Chollaya Chotivetthamrong และ Jittra Rukijkanpanich. Production time loss reduction in an ice-cream factory. ม.ป.ท.:Chulalongkorn University, 2006. Print.