Suwit Ratanakij. (1989) Available soil moisture simulation model for some upland crops. Mahidol University,:ม.ป.ท.Suwit Ratanakij. 1989. Available soil moisture simulation model for some upland crops. ม.ป.ท.:Mahidol University,;Suwit Ratanakij. Available soil moisture simulation model for some upland crops. ม.ป.ท.:Mahidol University, 1989. Print.