Gopal, Brij; Sharma, K. P. (1981). Water-hyacinth (Eichhornia Crassipes): The Most Troublesome Weed of the World. Hindasia Kadono, Yasuro (2004). “Alien aquatic plants naturalized in Japan: history and present status” . Global Environmental Research 8 (2): 163-169. http://www.airies.or.jp/attach.ph...