Li Quan
More recent English translations and studies reflect insights from modern Sinology, as surveyed by Reiter. Christopher Rand's article on Li Quan translates and interprets the "Huangdi Yinfujing" as a treatise on Chinese military strategy. Thomas Cleary published a popular translation with Liu Yiming's commentary. Another English translation was published by Fabrizio Pregadio. It includes the commentary by Yu Yan (1258–1314), a learned author of works on Neidan and Chinese cosmology.