Gigone, D., & Hastie, R. (1997) The impact of information on small group choice.  Journal of Personality and Social Psychology, 72, 132-140.

Paskevich, D., Brawley, L., Dorsch, K., & Widmeyer, W. (1999) Relationship between collective Efficacy and team cohesion: Conceptual and measurement issues.  Group Dynamics: Theory, Research, and Practice, 3, 210-222.

Smith, R., Webster, J., Parrott, W., & Eyre, H. (2002) The role of public exposure in moral and nonmoral shame and guilt.  Journal of Personality and Social Psycholgy, 83, 138-159.

Paskevich-

This study looked at cohesion of seven volleyball teams compared to performance.  A questionnaire was compiled based on previous research and administered by the couch or an investigator, to the team between two days before or after companion.  They looked at several aspects of cohesion in group activities and found many to be statistically significant.