Womack, J. P. (2005). Lean Solutions. Simon & Schuster.
Lua i Stíl Chicago (17ú heag.)Womack, James P. Lean Solutions. London: Simon & Schuster, 2005.
Lua MLA (9ú heag.)Womack, James P. Lean Solutions. Simon & Schuster, 2005.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.