Wirach Hirun และ Sompong Sirisoponsilp. (2009) Estimating freight origin destination matrices using combined commodity flow survey and roadside survey data. Chulalongkorn University:ม.ป.ท.Wirach Hirun และ Sompong Sirisoponsilp. 2009. Estimating freight origin destination matrices using combined commodity flow survey and roadside survey data. ม.ป.ท.:Chulalongkorn University;Wirach Hirun และ Sompong Sirisoponsilp. Estimating freight origin destination matrices using combined commodity flow survey and roadside survey data. ม.ป.ท.:Chulalongkorn University, 2009. Print.