Patiyuth, Somchai. “Survival of Rhizobia in Various Rations of Peat and Lignite”. Thai Agricultural Research Journal 9, no. 3 (September 1, 1991): 157–161. accessed October 1, 2026. https://li01.tci-thaijo.org/index.php/thaiagriculturalresearch/article/view/242389.