Phanthipa Sawatee และ Cheema Soralump. (2009) Efficiently enhanced environmental management system (ISO 14001) by pollution prevention in Thailand. Kasetsart University,:ม.ป.ท.Phanthipa Sawatee และ Cheema Soralump. 2009. Efficiently enhanced environmental management system (ISO 14001) by pollution prevention in Thailand. ม.ป.ท.:Kasetsart University,;Phanthipa Sawatee และ Cheema Soralump. Efficiently enhanced environmental management system (ISO 14001) by pollution prevention in Thailand. ม.ป.ท.:Kasetsart University, 2009. Print.