Anderson, V., & Johnson, L. (1997). Systems thinking basics: From concepts to causal loops. Pegasus Communications.
Lua i Stíl Chicago (17ú heag.)Anderson, Virginia, agus Lauren Johnson. Systems Thinking Basics: From Concepts to Causal Loops. Waltham: Pegasus Communications, 1997.
Lua MLA (9ú heag.)Anderson, Virginia, agus Lauren Johnson. Systems Thinking Basics: From Concepts to Causal Loops. Pegasus Communications, 1997.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.