Polsen, Nattha, Jinda Khlibtong, Chalermsak Toomhirun, and Ruth Sirisunyaluck. 2020. “Extension Workers Development Model for Role in Community Enterprises Extension and Development”. Ph.D. In Social Sciences Journal 10 (3):633-49. https://so05.tci-thaijo.org/index.php/phdssj/article/view/175294.