《徐霞客游记·溯江纪源 & 江源考》
不但如此，岷江流域的南边，又有条大渡河，西面源自吐蕃，流经黎州、雅州与岷江合流，在金沙江的西北方，它的源头也比岷江远但赶不上金沙江，所以推寻长江源头的，必定应当把金沙江作为第一。
不第此也，岷流之南，又有大渡河，西自吐蕾，经黎、雅与岷江合，在金沙江西北，其源亦长于岷而不及金沙，故推江源者，必当以金沙为首。
Not only that, there is a large Daba River in the southern part of the Minjiang River Basin, which originates from Tubo in the west, flows through Lizhou and Ya'an, and merges with the Minjiang River. In the northwest of the Jinsha River, its source is also than the Minjiang River, but it cannot catch up with the Jinsha River, so the one who traced the source of the Yangtze River must have regarded the Jinsha River as the first.