อิงคามระธร ท. (2018). THE UPGRADING TO SMART FARMER BY LEARNING FROM MASTER SMART FARMER OF PINEAPPLE PLANTATION FARMER IN RATCHABURI PROVINCE. Phranakhon Rajabhat Research Journal : Humanities and Social Sciences, 14(2), 121–134. retrieved from https://so05.tci-thaijo.org/index.php/PNRU_JHSS/article/view/131834