TSIAO, Teng-fu. 隋代苏元朗内外丹修炼法及其成就 The Achievement of Su Yuan-lang’s Inner and Outer Dan Practice in the Sui Dynasty. Journal of Sinological Studies 漢學研究學刊, [S.l.], v. 9, n. 1, p. 47-74, june 2018. ISSN 2180-4729. Available at: <https://ejournal.um.edu.my/index.php/joss/article/view/14854>. Date accessed: 17 sep. 2019.