Inner Canon of the Yellow Emperor, Basic Questions
Gu Congde edition of 1550
The Suwen is one of the two books that make up the Huangdi neijing,the earliest surviving classical work on TCM doctrines.The Inner Canon was probably written in the Warring States period,and attributed to the Yellow Emperor.It is one of the most important classics of TCM.(Collection of Library of China Academy of TCM).