《资治通鉴·唐纪·唐纪四十二》
当时，自许、汝、郑、邓一带的西面，都食用河东的池盐，由度支主管其事；自汴、滑、唐、蔡一带的东面，都是食用海盐，由刘晏主管其事。
时自许、汝、郑、邓之西，皆食河东池盐，度支主之；汴、滑、唐、蔡之东，皆食海盐，晏主之。
At that time, the areas west of Xu, Ru, Zheng, and Deng all consumed salt from the salt ponds of Hedong, which was managed by the Controller of Finances. The areas east of Bian, Hua, Tang, and Cai all consumed sea salt, which was managed by Liu Yan.