Sitthiwong, Nopparut. “Pigment and Nutritional Value of Spirogyra spp. in Sakon Nakhon, Nakhon Phanom and Mukdahan Provinces”. Progress in Applied Science and Technology 9, no. 1 (June 28, 2019): 10–21. accessed September 3, 2026. https://ph02.tci-thaijo.org/index.php/past/article/view/242965.