Which ancient book did China's earliest biography of doctors refer to?

It also puts forward the contribution of Sima Qian, a famous historian, to the study of Chinese medical history. Biographies of Historical Records, Bian Que and Cang Gong is the earliest biography of doctors in China. Sima Qian's description and research on Qin Yueren, a famous doctor in the Warring States Period, and Chunyu Kun, a famous doctor in the Western Han Dynasty, are of high level. He vividly and profoundly portrayed the image of He Chunyu Kun, correctly reflected the achievements of medical development at that time, and gave a high degree of generalization, summing up historical experience for the further development of medicine. He respected atheism and scientific attitude in medical development, supported the advanced, denounced the backward and spared no effort. This tradition has been going on for several generations without interruption. In this sense, it reflects the long history and glorious tradition of Chinese medical history research.