Fuchsia Dunlop, The Food of Sichuan (Londinii: Bloomsbury, 2019) pp. 21-24, cf. 471-474; Gernot Katzer, "Sichuan pepper"
tao-te-king.org
Laocius12; Zuo zhuan Zhao 9.5, 20.8a (Stephen Durrant, Wai-yee Li, David Schaberg, interprr., Zuo Tradition [Seattli: University of Washington Press, 2016] pp. 1448-1451, 1586-1587