Khanit Wannaronk และ Akkapol Senanarong; Prasat Sangphanta; Suphasit Sngiamphongse. (2003) Research and Development of an Off-Set Rotary Cultivator Implementing with a Small Four-Wheel Tractor for Fruit Tree Cultivation. <i>Thai Agricultural Research Journal</i>, <i>21</i>(3), 226-234.Khanit Wannaronk และ Akkapol Senanarong; Prasat Sangphanta; Suphasit Sngiamphongse. "Research and Development of an Off-Set Rotary Cultivator Implementing with a Small Four-Wheel Tractor for Fruit Tree Cultivation". Thai Agricultural Research Journal 21 (2003):226-234.Khanit Wannaronk และ Akkapol Senanarong; Prasat Sangphanta; Suphasit Sngiamphongse. Research and Development of an Off-Set Rotary Cultivator Implementing with a Small Four-Wheel Tractor for Fruit Tree Cultivation. Department of Agriculture:ม.ป.ท. 2003.