4[1]See"river."Encyclopaedia Britannica.Encyclopaedia Britannica Online[DB/OL].http://search.eb.com/ed/anicle-9109500.
5[1]原文见United Nations,Register of Intemational Rivers.Water Supply and Management.Vol.2 (1),1978.虽然该文被广泛引用,但多为转引,see:Asit K.Biswas,Register of Intemational Rivers:A Personal Reflection.International Journal of Water Resources Development,Vol.15 no.4.1999.