Chosa และ Michiko. (2000) Factors affecting infection of soil-transmitted helminths among primary school children in Vientiane, Lao P.D.R. Mahidol University,:ม.ป.ท.Chosa และ Michiko. 2000. Factors affecting infection of soil-transmitted helminths among primary school children in Vientiane, Lao P.D.R. ม.ป.ท.:Mahidol University,;Chosa และ Michiko. Factors affecting infection of soil-transmitted helminths among primary school children in Vientiane, Lao P.D.R. ม.ป.ท.:Mahidol University, 2000. Print.