Fay (1975), p. 143. Fay, Peter Ward (1975). The Opium War, 1840–1842: Barbarians in the Celestial Empire in the Early Part of the Nineteenth Century and the War by Which They Forced Her Gates Ajar. University of North Carolina Press.
Taylor Wallbank; Bailkey; Jewsbury; Lewis; Hackett (1992). "A Short History of the Opium Wars". Civilizations Past And Present. Chapter 29: "South And East Asia, 1815–1914" – via Schaffer Library of Drug Policy.