Supatra Emaruji และ Kamonchanok Suthiwartnarueput. (2006) Quality improvement in airfreight service : case study of Lufthansa Cargo Ag. Chulalongkorn University:ม.ป.ท.Supatra Emaruji และ Kamonchanok Suthiwartnarueput. 2006. Quality improvement in airfreight service : case study of Lufthansa Cargo Ag. ม.ป.ท.:Chulalongkorn University;Supatra Emaruji และ Kamonchanok Suthiwartnarueput. Quality improvement in airfreight service : case study of Lufthansa Cargo Ag. ม.ป.ท.:Chulalongkorn University, 2006. Print.