Anon sooksawad และ Kawaporn Pumchoei. (2004) Suitable Rice Variety and Fertilizer for Beneficial Return in Rainfed Lowland Coarse Texture Soils at Phitsanulok. <i>Thai Agricultural Research Journal</i>, <i>22</i>(3), 205-216.Anon sooksawad และ Kawaporn Pumchoei. "Suitable Rice Variety and Fertilizer for Beneficial Return in Rainfed Lowland Coarse Texture Soils at Phitsanulok". Thai Agricultural Research Journal 22 (2004):205-216.Anon sooksawad และ Kawaporn Pumchoei. Suitable Rice Variety and Fertilizer for Beneficial Return in Rainfed Lowland Coarse Texture Soils at Phitsanulok. Department of Agriculture:ม.ป.ท. 2004.