《资治通鉴·陈纪·陈纪七》
丁巳，北周铸造永通万国钱，以一当千，和五行大布一并流通。
丁巳，周铸永通万国钱，一当千，与五行大布并行。
On Dingsi day, the Northern Zhou Dynasty cast Yongtong Wanguo money, which was worth one thousand, and circulated it together with Wuxing Dabu.