1. Animal Behavior: An Evolutionary Approach;Alcock,1989
2. The search for a general theory of behavior;Alexander;Behavioral Science,1975
3. The Biology of Moral Systems;Alexander,1987
4. K'ekchi' horticultural labor exchange: Productive and reproductive implications;Berté,1988
5. Mating and parenting in Darwinian perspective;Betzig,1988