Cbatveera, B., and P. NtmJtyonglkul. “Use of Coconut Husk Ash, Com Cob Ash and Peanut Shell Ash as Pozzolana”. Engineering and Applied Science Research 21, no. 1-2 (April 25, 2013): 1–20. accessed April 1, 2025. https://ph01.tci-thaijo.org/index.php/easr/article/view/8131.