Foley RA (1990) The causes of brain enlargement in human evolution. Behavioural & Brain Sciences 13: 354-356.

Foley RA (1991) Comment on P Graves ‘The Neanderthal problem’. Current Anthropology 32: 529-530.

Foley RA (1991) How many species of hominid should there be? Journal of Human Evolution 20: 413-427.

Foley RA (1991) How useful is the culture concept in early hominid studies? In RA Foley (Ed) The Origins of Human Behaviour, pp. 25-38. London: Unwin Hyman.

Foley RA (1991) Introduction to ‘The Origins of Human Behaviour’. In RA Foley (Ed) The Origins of Human Behaviour, pp. 1-12. London: Unwin Hyman.

Foley RA (1991) The silence of the past. Nature 352: 114-115.

Foley RA (Ed) (1991) The Origins of Human Behaviour. London: Unwin Hyman.

Foley RA & Lee PC (1991) Ecology and energetics of encephalization in hominid evolution. Philosophical Transactions of the Royal Society London Series B 334: 223-232.

Layton R, Foley RA & Williams E (1991) The transition between hunting and gathering and the specialized husbandry of resources – a socioecological approach. Current Anthropology 32: 255-274. 

Lee PC & Foley RA (1991) Comment on Rudspeth et al. ‘The human society as a primate community’. Current Anthropology 32: 244-245.