Varaphorn Kamboonruang และ Walaiporn Sanwong; Somsak Siripanitcharoen; Pisit Promnart. (1995) Efficiency of Effective Microoraganism (EM) on Increasing Rice Yield. <i>Thai Agricultural Research Journal</i>, <i>13</i>(2), 110-116.Varaphorn Kamboonruang และ Walaiporn Sanwong; Somsak Siripanitcharoen; Pisit Promnart. "Efficiency of Effective Microoraganism (EM) on Increasing Rice Yield". Thai Agricultural Research Journal 13 (1995):110-116.Varaphorn Kamboonruang และ Walaiporn Sanwong; Somsak Siripanitcharoen; Pisit Promnart. Efficiency of Effective Microoraganism (EM) on Increasing Rice Yield. Department of Agriculture:ม.ป.ท. 1995.