Gitterman, A. a. S. L. (1986). Mutual aid groups and life cicle. F. E. Peacock.
Chicago-čujuhus (17. p.)Gitterman, Alex and Schulman Lawrence. Mutual Aid Groups and Life Cicle. F. E. Peacock, 1986.
MLA-čujuhus (9. p.)Gitterman, Alex and Schulman Lawrence. Mutual Aid Groups and Life Cicle. F. E. Peacock, 1986.
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