Search Results       Your search for [author]Ruffle, Bradley J. returned 1 record.           Cooperation and the in-group-out-group bias: a field test on Israeli kibbutz members and city residents. by Ruffle, Bradley J.; Amsterdam: Elsevier B.V, 2005. Subject: Social sciences04; Cooperation04; Field experiment04; Self-selection04; Socialization.          Add to Book Cart Relevance: 26.30%