HAINES STEPHEN G. (2000). COMPLETE GUIDE TO SYSTEMS THINKING AND LEARNING. HRD PRESS.
Lua i Stíl Chicago (17ú heag.)HAINES STEPHEN G. COMPLETE GUIDE TO SYSTEMS THINKING AND LEARNING. U.S: HRD PRESS, 2000.
Lua MLA (9ú heag.)HAINES STEPHEN G. COMPLETE GUIDE TO SYSTEMS THINKING AND LEARNING. HRD PRESS, 2000.
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