Wael Ahmed Fakihammed Ahmed และ Chantal Herberholz. (2013) DETERMINANTS OF INFORMAL SECTOR PARTICIPATION IN THE NATIONAL HEALTH INSURANCE FUND IN KASSALA STATE (EASTERN SUDAN). Chulalongkorn University:ม.ป.ท.Wael Ahmed Fakihammed Ahmed และ Chantal Herberholz. 2013. DETERMINANTS OF INFORMAL SECTOR PARTICIPATION IN THE NATIONAL HEALTH INSURANCE FUND IN KASSALA STATE (EASTERN SUDAN). ม.ป.ท.:Chulalongkorn University;Wael Ahmed Fakihammed Ahmed และ Chantal Herberholz. DETERMINANTS OF INFORMAL SECTOR PARTICIPATION IN THE NATIONAL HEALTH INSURANCE FUND IN KASSALA STATE (EASTERN SUDAN). ม.ป.ท.:Chulalongkorn University, 2013. Print.