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Emery F., E.L. Trist, . (1973). Towards A Social Ecology. New York: Penum Press.
Emery F.E, E.L. Trist, . 1973. Towards A Social Ecology. New York: Penum Press.
Emery F.E, E.L. Trist, . Towards A Social Ecology. New York: Penum Press. 1973.
