FITZGERALD JERRY. (1987). FUNDAMENTALS OF SYSTEM ANALYSIS: USING STRUCTURAL ANALYSIS (3.). JOHN WILEY AND SONS.
Lua i Stíl Chicago (17ú heag.)FITZGERALD JERRY. FUNDAMENTALS OF SYSTEM ANALYSIS: USING STRUCTURAL ANALYSIS. 3. JOHN WILEY AND SONS, 1987.
Lua MLA (9ú heag.)FITZGERALD JERRY. FUNDAMENTALS OF SYSTEM ANALYSIS: USING STRUCTURAL ANALYSIS. 3. JOHN WILEY AND SONS, 1987.
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