"The earliest extant collection of administrative law was the Tang Liudian 唐六典 (Compendium of admninistrative law of the six divisions of the Tang bureaucracy). It is based on all the different types of administrative law as these were applied in all branches of the bureaucracy in the early eighth century" n. 29: Da Tang Liudian 大唐六典, 738; the best Song edition was preserved in Japan and edited by Konoe Iehiro 近衛家熙, Kōtei Dai Tō rikuten 考訂大唐六典, 1724.--Wilkinson, Chinese history, a manual, p. 548.