Varaporn Pumsuvan. (1994) The hepatitis a antigen prevalent in drinking water, using water and risk behaviors of Bangplad Chaophraya river community, Bangkok. Mahidol University,:ม.ป.ท.Varaporn Pumsuvan. 1994. The hepatitis a antigen prevalent in drinking water, using water and risk behaviors of Bangplad Chaophraya river community, Bangkok. ม.ป.ท.:Mahidol University,;Varaporn Pumsuvan. The hepatitis a antigen prevalent in drinking water, using water and risk behaviors of Bangplad Chaophraya river community, Bangkok. ม.ป.ท.:Mahidol University, 1994. Print.