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Slater, Philip E. 1955 Role differentiation in small groups. American Sociological Review 20:300-310. Verba, Sidney 1961 Small Groups and Political Behavior. Princeton, N.J.: Princeton University Press. Waxler, N. and E. Mishler 1966 Scoring and reliability problems in interaction process analysis: a methodological note. Sociometry 29:28-40. Wheeler, D. K. 1957 Notes on 'role differentiation in small decision-making groups.' Sociometry 20: 145-151. Wilson, S. 1969 The effect of the laboratory situation on experimental discussion groups. Sociometry 32 (December): 220-236. Zelditch, M. 1955 Role differentiation in the nuclear family: a comparative study. Pp. 307-351 in T. Parsons et al., Family, Socialization and Interaction Process. Glencoe, Ill.: Free Press.
Marshall W. Meyer (Tue,) studied this question.
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