Pitchaya Pakharn and Patcharee Suriya. (2020) Analysis of Costs and Returns for Thunyasirin Rice Seed and Paddy Production in Thung Pong Sub-district, Ubolratana District, Khon Kaen Province. <i>Khon Kaen Agriculture Journal</i>, <i>48</i>(4), 763-786.Pitchaya Pakharn and Patcharee Suriya. "Analysis of Costs and Returns for Thunyasirin Rice Seed and Paddy Production in Thung Pong Sub-district, Ubolratana District, Khon Kaen Province". Khon Kaen Agriculture Journal 48 (2020):763-786.Pitchaya Pakharn and Patcharee Suriya. Analysis of Costs and Returns for Thunyasirin Rice Seed and Paddy Production in Thung Pong Sub-district, Ubolratana District, Khon Kaen Province. Faculty of Agriculture:ม.ป.ท. 2020.