B.R. Chandrasekar, G. Ambrose, & N. Jayabalan. (2005). Influence of biofertilizers and nitrogen source level on the growth and yield of Echinochloa frumentacea (Roxb.) Link. International Journal of Agricultural Technology, 1(2), 223–234. retrieved from https://li04.tci-thaijo.org/index.php/IJAT/article/view/9179