Galton, Francis, 1889. Natural Inheritance. New York, The Macmillan Company.

Galton, Francis, 1895. English Men of Science; Their Nature and Nurture. New York, D. Appleton and Company.

Galton, Francis, and Schuster, Edgar, 1906. Noteworthy Families (Modern Science). London, J. Murray.

Goddard, Henry Herbert, 1912. The Kallikak Family; a Study in the Heredity of Feeble-mindedness. New York, The Macmillan Company.

Goddard, Henry Herbert, 1914. Feeble-mindedness; Its Causes and Consequences. New York, The Macmillan Company.

Healy, William, 1915. The Individual Delinquent. Boston, Little, Brown and Company.

Kellicott, William E., 1911. The Social Direction of Human Evolution; an Outline of the Science of Eugenics. New York, D. Appleton and Company.

Morgan, Thomas Hunt, 1913. Heredity and Sex. New York, Columbia University Press.

Punnett, R. C., 1911. Mendelism. New York, The Macmillan Company. The best popular account of Mendelism.