Sixanonh และ Somxay. (1993) Variation in farming practices as related to resource availability : a case study in Tasseng Dongbang Laos. Khon Kaen University,:ม.ป.ท.Sixanonh และ Somxay. 1993. Variation in farming practices as related to resource availability : a case study in Tasseng Dongbang Laos. ม.ป.ท.:Khon Kaen University,;Sixanonh และ Somxay. Variation in farming practices as related to resource availability : a case study in Tasseng Dongbang Laos. ม.ป.ท.:Khon Kaen University, 1993. Print.