Morris, I., Seaford, R., Spence, J. D., Korsgaard, C. M., Atwood, M., & Macedo, S. (2015). Foragers, farmers, and fossil fuels: How human values evolve. Princeton University Press.
Lua i Stíl Chicago (17ú heag.)Morris, Ian, Richard Seaford, Jonathan D. Spence, Christine M. Korsgaard, Margaret Atwood, agus Stephen Macedo. Foragers, Farmers, and Fossil Fuels: How Human Values Evolve. Princeton: Princeton University Press, 2015.
Lua MLA (9ú heag.)Morris, Ian, et al. Foragers, Farmers, and Fossil Fuels: How Human Values Evolve. Princeton University Press, 2015.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.