Pettigrew, A. (1989). Longitudinal Methods to Study Change: Theory and Practice. Routledge.
Chicago-čujuhus (17. p.)Pettigrew, A. Longitudinal Methods to Study Change: Theory and Practice. Routledge, 1989.
MLA-čujuhus (9. p.)Pettigrew, A. Longitudinal Methods to Study Change: Theory and Practice. Routledge, 1989.
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