1. Bacaër, Nicolas. 2011. A Short History of Mathematical Population Dynamics. New York: Springer. (English Translation of Histoires de mathématiques et de populations, Editions Cassini, Paris, 2009).
2. Bowler, Peter J. 2009. ‘Darwin’s Originality.’ Science 323: 223–226.
3. Chalub, Fabio A. C. C., and Rodrigues, José F. eds. 2011. The Mathematics of Darwin's Legacy. Birkhäuser.
4. Darwin, Charles. 1871. The Descent of Man. London:John Murray.
5. Darwin, Charles. 1875. The Variation of Animals and Plants Under Domestication, 2 vols, 2nd ed. London:John Murray.