《新五代史·列传·杂传第三十四》
康福世世代代本为蛮夷人，蛮夷中以沙陀族为高贵，因此常自称为沙陀种。
福世本夷狄，夷狄贵沙陀，故常自言沙陀种也。
Kangfu’s ancestors were barbarians. Among the barbarians, the Shatuo clan was the noblest, so he often called himself of the Shatuo clan.