8
The Influence of Unfavourable Home Environment and Defective Physique on the Intelligence of School Children. Por David Heron. Eugenics Laboratory (London), Memoir Series No. VIII.
9
Hereditary Genius; an Inquiry into its Laws and Consequences. Londres, 1869.
10
Woods, Frederick Adams, «Heredity and the Hall of Fame», Popular Science Monthly, mayo de 1913.