《资治通鉴·汉纪·汉纪七》
九月，文帝下诏，令诸侯王、公卿、郡守举荐贤良、能直言极谏的人，皇帝亲自策问考试。
九月，诏诸侯王、公卿、郡守举贤良、能直言极谏者，上亲策之。
In September, Emperor Wen issued an imperial edict, ordering the vassal kings, ministers, and the governors of commanderies to recommend people who were virtuous, talented, and who dared to speak up and remonstrate, inviting them to the imperial palace for personal examination and assessment.