ทวีหิรัญรัฐกิจ ณ., ปิยะทัต เ. and จิระจรัส ส. 2018. The Relationship of Personal Factors Affecting in Cup lump Production Condition of Thasae Agricultural Cooperative, Amphoe Thachang, Suratthani Province. Journal of Management Sciences Suratthani Rajabhat University. 5, 2 (Oct. 2018), 205–232.