Galton F. Hereditary talent and character //Macmillan’s Magazine. — 1865. — Т. 12. — №. 157—166. — С. 318—327.
↑Doolittle J. Social Life of the Chinese: With Some Account of Their Religious, Governmental, Educational, and Business Customs and Opinions; with Special But Not Exclusive Reference to Fuhchau. — Harper & Bros., 1865.
↑Lubbock J. Pre-historic times. — Williams and Norgate, 1865.