1. C. Darwin, The Descent of Man (D. Appleton, 1871).
2. K. Lorenz, On Aggression (Routledge, 1966).
3. E. O. Wilson, Sociobiology: The New Synthesis (Harvard Univ. Press, 1975).
4. J. Archer, F. Huntingford, in The Dynamics of Aggression (Psychology Press, 2013), pp. 21–50.
5. W. R. Hess, Physiologie 42, 554 (1928).