Rangsipaht S, Ponortong S, Kukangwan T. Problems of Extension Communication in Central Administration, Dept. of Agricultural Extension in 1993. kasetsart J. Soc. Sci. [internet]. 1994 Jan. 1 [cited 2026 Sep. 11];15(1):13-22. available from: https://so04.tci-thaijo.org/index.php/kjss/article/view/236896