The private cost of using tractors versus buffaloes: a case study of farmer in Cha Choeng Sao province - Songsak Sriboonchitta (Thammasat University, Bangkok: Faculty of Economics, 1975)
Moaster thesis,Thammasat University, 1975.
p. 140 - p. 142.
Keywords: Plows -- Economic aspects; Tractors -- Economic aspects; Buffaloes -- Economic aspects