Rungthip Sengluang และ Peerasak Srinives; Prasert Chatwachirawong. (1998) A Database for Calculating Cost and Profit of Cropping Systems. <i>Thai Agricultural Research Journal</i>, <i>16</i>(1), 69-73.Rungthip Sengluang และ Peerasak Srinives; Prasert Chatwachirawong. "A Database for Calculating Cost and Profit of Cropping Systems". Thai Agricultural Research Journal 16 (1998):69-73.Rungthip Sengluang และ Peerasak Srinives; Prasert Chatwachirawong. A Database for Calculating Cost and Profit of Cropping Systems. Department of Agriculture:ม.ป.ท. 1998.