Panas Khumnun และ Ruth Sirisunyaluck. (2017) Opinions of Agricultural Extension Officers towards Implementation of MRCF Extension System in Upper North of Thailand. <i>Journal of Community Development and Life Quality</i>, <i>5</i>(3), 544-561.Panas Khumnun และ Ruth Sirisunyaluck. "Opinions of Agricultural Extension Officers towards Implementation of MRCF Extension System in Upper North of Thailand". Journal of Community Development and Life Quality 5 (2017):544-561.Panas Khumnun และ Ruth Sirisunyaluck. Opinions of Agricultural Extension Officers towards Implementation of MRCF Extension System in Upper North of Thailand. Upper Northern Reserch Administration Network:ม.ป.ท. 2017.