《太平广记·卷三百四十九·鬼三十》
韦生回答说：我春初去塞外游览，从鄜坊经过乌延，到达平复，最后到灵武，然后返回来，买到了几匹部落的骏马。
对曰：予春初塞游，自鄜坊历乌延，抵平夏。止灵武而回。
Wei Sheng replied saying: I travelled to the Sabei during early spring. Passing through Fufang, I proceeded by way of Wuyan to Pingfu and then to Lingwu, before returning. I bought a few steeds from the tribes.