Sobek II, D. K. (2008). Understanding A3 Thinking. CRC Press.
Lua i Stíl Chicago (17ú heag.)Sobek II, Durward K. Understanding A3 Thinking. Boca Raton ; London: CRC Press, 2008.
Lua MLA (9ú heag.)Sobek II, Durward K. Understanding A3 Thinking. CRC Press, 2008.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.