Não informado. (1991). Cybernetics and Systems Analysis. Consultants Bureau.
Lua i Stíl Chicago (17ú heag.)Não informado. Cybernetics and Systems Analysis. New York: Consultants Bureau, 1991.
Lua MLA (8ú heag.)Não informado. Cybernetics and Systems Analysis. Consultants Bureau, 1991.
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