Wiangsamut, B., and Koolpluksee, M. “Yield and growth of Pak Choi and Green Oak vegetables grown in substrate plots and hydroponic systems with different plant spacing”. International Journal of Agricultural Technology 16, no. 4 (July 15, 2020): 1063–1076. accessed September 15, 2025. https://li04.tci-thaijo.org/index.php/IJAT/article/view/7259.