[14] Bogardus: American Journal of Sociology, May 1924, p. 703.
[15] Lindeman: Social Discovery, p. 44.
[16] Lindeman: Social Discovery, p. 120.
[17] Davis: Psychological Interpretations of Society, p. 9.
[18] Cited in Elwood, p. 330.
[19] Ellwood, p. 330.
[20] Baldwin, p. 571.
[21] Lindeman, p. 136.
[22] Dennes: Method and Presuppositions of Group Psychology, p. 145.
[23] MacDougall: Group Mind, p. 12.