社会契約論
"The Social Contract" continues Ardrey's work on understanding how evolutionarily inherited traits are manifest by contemporary man. In particular "The Social Contract" examines society and hierarchy in terms of genetic diversity. The edition cites many of the scientists who were important influences on Ardrey, including Raymond Dart and Konrad Lorenz. It was illustrated, like the first two books, by Ardrey's wife, the South African actress and illustrator Berdine Ardrey (née Grunewald).