《水经注·卷二十九》
刘澄之说白水注入潜水，然而白水与羌水汇合后注入汉水，那么也还是汉水。
刘澄之称白水入潜，然白水与羌水合入汉，是犹汉水也。
Liu Chengzhi said the Baishui river flows into the Su river, however the Baishui river joins the Qiang river and then flows into the Han river, so ultimately it is still the Han river.