Goethals, G. R. (1986). Social comparison theory: Psychology from the lost and found. Personality and Social Psychology Bulletin, 12(3), 261–278.
Schmitt, M. T., Silvia, P. J., & Branscombe, N. R. (2000). The intersection of self-evaluation maintenance and social identity theories: Intragroup judgment in interpersonal and intergroup contexts. Personality and Social Psychology Bulletin, 26(12), 1598–1606.