《晋书·志·第六章》
汉朝兴盛之后，制止了秦朝焚书之弊，张苍开始研讨律历，但尚未完备。
及汉兴，承秦之弊，张苍首治律历，颇未能详。
After the Han dynasty flourished, it put an end to the evil practice of burning books in the Qin dynasty, Zhang Cang began to study the calendar, but it was not yet complete.