1. Participation in Heterogeneous Communities*
2. Public Goods and Ethnic Divisions
3. Aronson, Eliot, and Shelley Patnoe, The Jigsaw Classroom: Building Cooperation in the Classroom (New York, NY: Longman (2nd edition), 1997).
4. Brown, Roger, Social Psychology: The Second Edition (New York, NY: The Free Press, 1986).