1. Abrams, D., & Hogg, M. A. (Eds.). (1990). Social identity theory: Constructive and critical advances. New York, NY: Springer.
2. Adolphs, R. (2003). Cognitive neuroscience of human social behaviour. Nature Reviews Neuroscience, 4, 165–178.
3. Alexander, R. D. (1989). Evolution of the human psyche. In P. Mellars & C. Stringer (Eds.), The human revolution: Behavioural and biological perspectives on the origins of modern humans (pp. 455–513). Princeton, NJ: Princeton University Press.
4. Alexander, R. D. (1990). How did humans evolve? Reflections on the uniquely unique species. Museum of Zoology (Special Publication No. 1, pp. 1–38). Ann Arbor: The University of Michigan.
5. Ash, J., & Gallup, G. G., Jr. (2007). Paleoclimatic variation and brain expansion during human evolution. Human Nature, 18, 109–124.