Chantra Tongcumpou. (1987) The Study on peat utilization as cation exchanger. Mahidol University,:ม.ป.ท.Chantra Tongcumpou. 1987. The Study on peat utilization as cation exchanger. ม.ป.ท.:Mahidol University,;Chantra Tongcumpou. The Study on peat utilization as cation exchanger. ม.ป.ท.:Mahidol University, 1987. Print.