«Treaty of Tientsin [Tianjin 1858]». Arxivat de l'original el 5 març 2016. « Article LI. It is agreed that, henceforward, the character “I” [barbarian], shall not be applied to the Government or subjects of Her Britannic Majesty in any Chinese official document issued by the Chinese Authorities either in the Capital or in the Provinces.»
Sir Adolphus William Ward; George Walter Prothero; Sir Stanley Mordaunt Leathes; Ernest Alfred Benians The Cambridge Modern History. Macmillan, 1910, p. 573.
«Treaty of Tientsin [Tianjin 1858]». Arxivat de l'original el 5 març 2016. « Article LI. It is agreed that, henceforward, the character “I” [barbarian], shall not be applied to the Government or subjects of Her Britannic Majesty in any Chinese official document issued by the Chinese Authorities either in the Capital or in the Provinces.»