How did brains evolve? (2002)
Journal Article
Barton, R. (2002). How did brains evolve?. Nature, 415, 134-135. https://doi.org/10.1038/415134a

Primate brains and life histories. (2002)
Book Chapter
Deaner, R., Barton, R., & van Schaik, C. (2002). Primate brains and life histories. In P. Kappeler (Ed.), The evolution of primate life histories (233-265). The University of Chicago Press