《资治通鉴·魏纪·魏纪六》
最初，太祖还是魏公时，任命赞令刘放、参军事孙资同时担任秘书郎。
初，太祖为魏公，以赞令刘放、参军事孙资皆为秘书郎。
Previously, when Emperor Taizu was still the Duke of Wei, he appointed Liu Fang as Minister of Acclamation and Sun Zi as Staff Officer (to the central government); they simultaneously served as Bureaucrats of Ministry,