Phakwipha Wutthiwaree และ Knit wannarong; Akkapol Senanarong; Suphasit Sngiamphongse; Snuchit Chamsing; Yuttana Khaehanchanpong; Prasart Sangpanta. (2006) Research and Development of Rotary Puddler for Secondary Tillage In Irrigated Paddy Field. <i>Thai Agricultural Research Journal</i>, <i>24</i>(2), 141-152.Phakwipha Wutthiwaree และ Knit wannarong; Akkapol Senanarong; Suphasit Sngiamphongse; Snuchit Chamsing; Yuttana Khaehanchanpong; Prasart Sangpanta. "Research and Development of Rotary Puddler for Secondary Tillage In Irrigated Paddy Field". Thai Agricultural Research Journal 24 (2006):141-152.Phakwipha Wutthiwaree และ Knit wannarong; Akkapol Senanarong; Suphasit Sngiamphongse; Snuchit Chamsing; Yuttana Khaehanchanpong; Prasart Sangpanta. Research and Development of Rotary Puddler for Secondary Tillage In Irrigated Paddy Field. Department of Agriculture:ม.ป.ท. 2006.