Sonam, Thubten, และ Niwat Martwanna. 2011. “Smallholder Dairy farmers’ Group Development in Bhutan:Strengthening Rural Communities through Group Mobilization”. วารสารแก่นเกษตร 39 (4):413-28. https://li01.tci-thaijo.org/index.php/agkasetkaj/article/view/250604.