Noinumsai, S., S. Waipib, and C. Chada. “Enhancement of Phosphate Adsorption Efficiency in Synthetic Wastewater Using Water Treatment Plant Sludge Combined with Cocoa Husk”. Burapha Science Journal, vol. 31, no. 2 May-August, May 2026, pp. 499-18, https://li05.tci-thaijo.org/index.php/buuscij/article/view/836.