《资治通鉴·隋纪·隋纪四》
各部族的姓氏虽然不同，但都通称为铁勒，与突厥人的习俗大致相同，以侵略掠夺为生，没有大的君长，分属东、西突厥。
族姓虽殊，通谓之铁勒，大抵与突厥同俗，以寇抄为生，无大君长，分属东、西两突厥。
Although the surnames of the various tribes were different, they were generally referred to as Tiele, and their customs were similar to those of the Turks, who made a living by invading and looting with no great sovereign, and they belonged to the Eastern and Western Turks.