[Called also Tome IV] || Social Pressures in Informal Groupsby Festinger; Schachter;Deviation, Rejection and Communication (article), in The Journal of Abnormal and Social Psychology, vol. 46, no 2by S. Schachter;Interpersonal Communication (article), in The Journal of Abnormal and Social Psychology, vol. 46, no 1by Festinger; Thibaut;Influence through Social Communication (article), in The Journal of Abnormal and Social Psychology, vol. 46, no 2by Back;On Group Cohesiveness (article), in The American Journal of Sociology, vol. 37, no 6by Gross; Martin;The Analysis of Small Groups Interaction (article), in American Sociological Review, vol. 15, no 2by R. F. Bales;Current Trends in Sociometry in Sociometry, vol. XV, nos 1-2by J. L. Moreno