《旧唐书·本纪·卷十七》
九月初一为庚寅日，淄青地区开始确定两税金额，淄、青、齐、登、莱五州共计一十九万三千九百八十九贯。从这时起，淄青才开始向国家上交赋税。
九月庚寅朔，淄青初定两税额，五州一十九万三千九百八十九贯，自此淄青始有上供。
The first day of the ninth month (the Gengyin day), taxation was implemented in the Ziqing area. The total amount of taxation from the five prefectures Zi, Qing, Qi, Deng, and Lai was 193,989 guan. From that time on, Ziqing began to pay taxes to the state. 