《资治通鉴·唐纪·唐纪七十六》
杨行密察看成及家里收藏的东西，只有图书、药物，很敬重他，把他放回，并任命为行军司马。
行密阅及家所蓄，惟图书、药物，贤之，归，署行军司马。
Yang Xingmi examined Cheng Ji’s household possessions and saw only books and medicine, and he greatly respected him, released him, and promoted him to acting military strategist. 