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Toward a general theory of action
Parsons, Talcott, (1962)
Research methods in the behavioral sciences
Festinger, Leon, (1965)
Research Methods in social relations
Selltiz, Claire, (1961)
Untersuchungsmethoden der Sozialforschung
Selltiz, Claire,
Discriminatory behavior in New York restaurants: 1950 and 1981
Schuman, Howard, (1983)