Khanal และ Raja Ram. (1988) The factors affecting the use of sanitary latrines of villagers in Uthong district of Suphanburi province, Thailand. Mahidol University,:ม.ป.ท.Khanal และ Raja Ram. 1988. The factors affecting the use of sanitary latrines of villagers in Uthong district of Suphanburi province, Thailand. ม.ป.ท.:Mahidol University,;Khanal และ Raja Ram. The factors affecting the use of sanitary latrines of villagers in Uthong district of Suphanburi province, Thailand. ม.ป.ท.:Mahidol University, 1988. Print.