Vivat Keawdounglek และ Chamlong Poboon. (2017) Management model for biogas production from wastewater of natural rubber processing at the community level. National Institute of Development Administration:ม.ป.ท.Vivat Keawdounglek และ Chamlong Poboon. 2017. Management model for biogas production from wastewater of natural rubber processing at the community level. ม.ป.ท.:National Institute of Development Administration;Vivat Keawdounglek และ Chamlong Poboon. Management model for biogas production from wastewater of natural rubber processing at the community level. ม.ป.ท.:National Institute of Development Administration, 2017. Print.