Mamun , Md. Abdullah Al, Rakiba Shultana, Md. Masud Rana, and Abdul Jalil Mridha. 2013. “Economic Threshold Density of Multi Species Weed for Direct Seeded Rice”. Asian Journal of Agriculture and Rural Development 3 (8):523-31. http://archive.aessweb.com/index.php/5005/article/view/872.