Poungsuk, P., Piyanard, J., and Nitikorn, J. “The problems and obstructions on teaching and learning of agricultural subject of agricultural teachers in Secondary School in Northeast Region of Thailand”. International Journal of Agricultural Technology 11, no. 2 (February 20, 2015): 459–471. accessed August 7, 2025. https://li04.tci-thaijo.org/index.php/IJAT/article/view/6265.