Sultana และ Ali Ashrafi. (2006) Community based forest rehabilitation-A lesson learnt from Petroleum Authority of Thailand (PTT) /. Kasetsart University,:ม.ป.ท.Sultana และ Ali Ashrafi. 2006. Community based forest rehabilitation-A lesson learnt from Petroleum Authority of Thailand (PTT) /. ม.ป.ท.:Kasetsart University,;Sultana และ Ali Ashrafi. Community based forest rehabilitation-A lesson learnt from Petroleum Authority of Thailand (PTT) /. ม.ป.ท.:Kasetsart University, 2006. Print.