Khanitchaidecha, W., P. Pitakwinai, K. Ratananikom, and A. Nakaruk. “Statistical Analysis of Water Quality Parameters in Downstream of Nan River, Thailand”. Naresuan University Engineering Journal, vol. 14, no. 2, Dec. 2019, pp. 14-23, https://ph01.tci-thaijo.org/index.php/nuej/article/view/187065.