“Organizations and the System Concept” in Katz, Daniel, and Robert L. Kahn, The Social Psychology of Organizations, 1966, 1978 & 1990, John Wiley and Sons. Highly recommended. This classic is arguably the best chapter-length introduction to system concepts there is. Available at a library near you. Reprinted in Classics of Organization Theory, by Shafritz, Ott & Jang (eds.), Wadsworth Publishing.
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