赵尔丰及其巴塘经营[pranala nonaktif permanen] (Zhao Erfeng and his Batang management), cnki.com.cn. (Author not specified): 'When Zhao Erfeng took office at the Yongning Daotai in the Xuyong Hall of Sichuan, he had murdered more than 3,000 innocent people in Gulin County, and from then on he became famous as "Zhao Tuhu".' (machine translation)