Tsigkas Alexander. (2013). Lean Enterprise. Springer.
Lua i Stíl Chicago (17ú heag.)Tsigkas Alexander. Lean Enterprise. New York: Springer, 2013.
Lua MLA (9ú heag.)Tsigkas Alexander. Lean Enterprise. Springer, 2013.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.