《旧唐书·列传·卷一百一十四》
王播便奏请携盐铁使印赴镇，并奏请另赐上都院印，诏命允从。
仍请携盐铁印赴镇，上都院印，请别给赐，从之。
Wang Bo immediately requested that he be allowed to take the seal of Commissioner for Transporting Salt and Iron with him to Zhen and also to be granted another seal for the Shangduyuan. The emperor approved his request.