《资治通鉴·梁纪·梁纪十三》
赵刚劝说宇文泰将贺拔胜、独孤信等人从梁朝召回来，宇文泰委托赵刚前去邀请。
刚说泰召贺拔胜、独孤信等于梁，泰使刚来请之。
Zhao Gang advised Yuwen Tai to summon He Bas heng, Dugu Xin, and others back from the Liang Dynasty, and Yuwen Tai entrusted him with going to invite them.