อิงคามระธร ท. THE UPGRADING TO SMART FARMER BY LEARNING FROM MASTER SMART FARMER OF PINEAPPLE PLANTATION FARMER IN RATCHABURI PROVINCE. PNRU JHSS [internet]. 2018 Oct. 21 [cited 2026 Sep. 28];14(2):121-34. available from: https://so05.tci-thaijo.org/index.php/PNRU_JHSS/article/view/131834