Gribbin, J. R. (1988). The one per cent advantage: The sociobiology of being human. Blackwell.
Dyfyniad Arddull ChicagoGribbin, John R. The One Per Cent Advantage: The Sociobiology of Being Human. Oxford: Blackwell, 1988.
Dyfyniad MLAGribbin, John R. The One Per Cent Advantage: The Sociobiology of Being Human. Blackwell, 1988.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.