Supranee Tongpradit. (2000) Hepatitis A virus antibody prevalence and environmental sanitation conditions among Akha-hill tribe youth, Chiangrai province, Thailand. Mahidol University,:ม.ป.ท.Supranee Tongpradit. 2000. Hepatitis A virus antibody prevalence and environmental sanitation conditions among Akha-hill tribe youth, Chiangrai province, Thailand. ม.ป.ท.:Mahidol University,;Supranee Tongpradit. Hepatitis A virus antibody prevalence and environmental sanitation conditions among Akha-hill tribe youth, Chiangrai province, Thailand. ม.ป.ท.:Mahidol University, 2000. Print.