1. Galton, Francis , 1889, Travels in south Africa (enlarged and amended from 1st edition. 1853)
2. Mountfield, David , 1976, African exploration
3. Galton, Francis , 1911, Enquiries into human faculty (2nd ed.)
4. Wallis, J.R. , 1936, Fortune my foe: life of C.J. Andersson
5. Forrest, D.W. , 1974, Francis Galton: the life and work of a Victorian genius