1. Play Fighting;Aldis,1975
2. Observational study of behaviour: Sampling methods;Altmann;Behaviour,1974
3. The influence of familiarity and friendship on children's social behavior;Attili;Paper presented at the I European Conference on Behavioural development,1984
4. An ethological study of some aspects of social behavior of children in nursery school;Blurton-Jones,1967
5. Categories of child-child interaction;Blurton-Jones,1972