《旧唐书·列传·卷一百二十三》
当太学将儒家经典刻在石碑上时，郑覃奏请由起居郎周土犀、水部员外郎崔球、监察御史张次宗、礼部员外郎温业等人，校定《诗》、《书》、《易》等儒家九经的文字，并旋即将刊定的文本刻在石上。
时太学勒石经，覃奏起居郎周墀、水部员外郎崔球、监察御史张次宗、礼部员外郎温业等，校定《九经》文字，旋令上石。
When the Imperial Academy was engraving the Confucian classics on stone tablets, Zheng Tan memorialized and requested Imperial Attendant Zhou Tuxi, Water Conservancy Department External Official Cui Qiu, Supervisory Censor Zhang Cizong, Board of Rites External Official Wen Ye and some others to proofread the texts of the Nine Confucian Classics, including the Book of Poetry, Book of Documents, Book of Changes, etc. and then promptly inscribe the finalized texts on stone.