《北史·列传·卷八十六》
乘坐大车辆，追逐水草畜牧繁衍生息，数年以后，知道食用粮食，每年奉献贡品。
乘高车，逐水草，畜牧蕃息，数年之后，渐知粒食，岁致献贡。
They traveled in large carts, following the water and grass to graze and breed livestock. After a few years, they learned to eat grain, and they paid tribute every year.