Tung, H. F. “The Decomposition and N Mineralization OfAzolla Pinnata in Moist and Flooded Soil”. Malaysian Journal of Science 15, no. 1&2 (July 27, 1994): 35–38. Accessed December 23, 2024. https://ajba.um.edu.my/index.php/MJS/article/view/4743.